Horizontal well is one of the pivotal techniques that brought about wide-spacing and high-productivity and highly efficient development in Tarim Oilfield.This paper mainly discusses the mature and matching designing and principal of horizontal well optimizing during various periods in diverse hydrocarbon reservoirs,such as new oil and gas field exploitation,ageing oil and gas field adjustment and excavation,development of gas or condensate gas fields in Tarim Oilfield,and so on,and makes a comparison of positive .
Kela 2 gas field,with the world-scale size,located in the north edge of Tarim basin,which is characterized with large-scale,mono-block,high gas column,abnormal over-pressure,high productivity,great difficulty in well completion, etc.It is necessary to evaluate the risk of production stabilization,to optimize the single well production rate,to make the field pressure under control,to precisely calculate the well controlled reserves,to maximum the utilization of nature energy in its initial exploitation stage.
The paper analyzes the hydrocarbon accumulation of gas pools in the western Sichuan foreland basin,northern Qaidam thrust and southern Junggar foreland basin.It indicates that the oil-gas fields were formed by multi-stage filling and that the gas pools accumulated in the late stages of the foreland basins.There were two most important stages for oil-gas accumulation in the foreland basins of central and western China,one was the Late Yanshanian movement when oil and gas accumulated mainly from Permian.
This article discussed the definition of hydrocarbon accumulation system and maintained that the hydrocarbon accumulation system,different from petroleum system,was an individual concept,which can be regarded as the assembly of factors of hydrocarbon migration and accumulation.The research focus of hydrocarbon accumulation system was in oil and gas reservoir.Based on the analysis for the tectonic features,hydrocarbon accumulation factors and features,the southern Junggar foreland basin can be divided.
The sand bodies of the braided delta front are the main sandstone reservoirs of the Xujiahe formation in the western Sichuan foreland basin.The sand bodies are consisted of quartz sandstone and lithic sandstone with abundant impurity and lithic fragment.Field observation and(cast) thin-section analysis indicate: the reservoir of area is low porosity and low permeable reservoir.The main type of pores is the secondary porosity.The result of the successive research indicate: the types of reservoir in Xujiahe.
According to the macro-observation of the outcrop sections and drilling core of Leikoupo formation of Middle Triassic in northwest Sichuan basin,and the analysis of such supporting materials as thin-section,cathode luminescence,electron microprobe and mineral inclosure,the author makes a comparatively deep study of the structure,characteristics and composition forms of the cement in the sparry grain dolomite and the blue green algae agglutinate dolomite of the Leikoupo formation reservoir.
Yanji basin is located in the west of south Tianshan Orogenic Belt and is a Mesozoic-Cenozoic basin on the folded base in Hercynian period.As a small Jurassic petroleum basin in the northwest area,Yanji basin,which is similar to the surrounding basins auch as Tarim,Tuha basin,owns its peculiar petroleum geology conditions.The Mesozoic prototype basin had the depositional evolution characteristics of rension-twist faulted basin.Its structural deformation with the features of compression and strike-slip.
The fault planes of reverse faults in south-west of Qaidam basin are shovel and the growth indexes are ranging from 1.3 to 2.5,the fault throws become smaller from bottom to top and more and more strong from one side to another laterally, and they are typical synsedimentary compressive-shear faults.The evolution process can be divided into four stages: synsedimentary faulting,folding,sleeping and activating.The active NWW mainly faults control the structural zones and the combination of source rock,reservoier.
The structural manner studying provides a crucial presumption of tectonic movement and developing processes.Tense-shearing and compresso-shearing structure accompanies two types of structural manners with striking and extending and contrcting action.A static coming from abundance of tense-shearing and compresso-shearing faults indicates that the two types of faults have specific spacial and profiling characters in sedimentary basins.What means that the former discerning of tense-shearing and compresso-shear.
Yulin gas field is one of the important gas fields in Ordos basin.Permian Shan 2 member sandstone is the main reservoir,and the diagenesis process of the member was complicated.For uncover the main controlling factors of pore development in this gas field,on the basis of thin section examination of rock,we analyzed Shan 2 member sandstone by multiple stepwise regression,divided the affecting factors of pore growth into three: sediment variable,acidic variable and reductive variable,and discovered the prime.
The research of fractured oil and gas reservoir prediction is in the search stage worldwide,quantitative research of spatial distribution and fracture apparent parameter of reservoir fracture is very important topic in the petroleum science.For quantitative prediction of structural fracture,that means modeling and calculating palaeo-structure stress field formed in fracture stage,usually we use three-dimensional finite element modeling technique for quantitatively predicting fracture,for confirming system.
The Yanchang formation(Triassic) in the Ordos basin is the reservoir sandstone of the low porosity and low permeability.How has the hydrocarbon produced by the source of the Member 7 migrated to compact reservoir? What are the dynamic power and pathways for migration? These questions constitute long-term focuses.The article has adopted the methods of compaction research and palaeohydrodynamic modeling.Overpressure of Member 1 to 6 of Yanchang Formation has been resumed.Distributions and evolution of petrole.
Karstic geomorphies are consisted of karstic upland,slope and depression.Karst basins are considered mixed water area,in which pore spaces are sorely filled and reservoir properties are unsavoury.With ingoing exploration,good reservoir beds which are located in microumbones are found in some of karst depressions.Combined with thickness map of benxi formation of Carboniferous and distributed relation map of basement rift and magmatite,chronic activity of basement rif leads to the formation of microumbones.
Ordos basin is a large multicycle superimposed basin,developed on the basement of crystalline basement from Archean to early Proterozoic.The course of evolution develop steadily,at the same time develop with activity.In the paper,according to drilling and seism datum,recover ancient tectonic configuration,combine with sedimentary characteristic,plot out evolution phases of basin.Its development suffered four periods,aulacogen basin developed on middle-late Proterozoic,Karton basin developed on Paleozoic.
In order to accurately estimate the producible reserves of natural gas and condensate oil in condensate pool,a new model,which was derived from the relationship between oil & gas production,cumulative production and time in the Hubbert estimation model,taking scrap production of condensate pool in current economic and technical conditions,can be used to calculate effective production time and economical producible reserves of oil & gas in condensate pool.Through practice,the estimates using this method.
In face of a shortage of reserves of QHD32-6 oil field in China,the study is carried out as QHD27/33 3D area is in the vicinity of QHD32-6 oil field,and have potential beneficial result from development,as soon as there are 3 wells differing in oil show so correlative reservoirs need evaluation.The purpose of the study is for provided drilling point of oil and gas exploration.The research start with well datum.description on the structure and traps get fine detail,and by log data processing,stratigraphic.
Coherence Cube technique is an analysis technique in assistant interpretation field.It has greatly improved in the last few years.This technique is used to predict the carbonate rock crack growth and identify boundary of lithology abnormal bodies and small fault and the relationship between the faults in the Sangtamu and Kela two 3D survey of Talimu basin and Daqingzijing 3D survey of the south of Songliao basin.Thereby,resolving array question between the faults of normal seismic interpretation.
Based on the study of clay mineral types,characters of rock frameworks and grains,wettability of the rocks,conductance of special heavy minerals,the origin of low resistivity reservoir of Qiangjiang formation in Qiangjiang sag is identified: rock’s character of reservoir has a little infection on the formation of low resistivity reservoir;irreducible water content in the rock is the major factor;the odditional conductivity caused by mud and clay and incursion of the mud filtrate are the minor factors.
In BD 13 area,Qiongdongnan basin,South China Sea,Seismic anomaly body of Sanya formation I Section with wider abnormal range than structure size,which may be a gas-bearing lithologic trap formed under a structural background,has good conditions for hydrocarbon accumulation.To determine the potential gas resource,seismic inversion on pseudo-sonic curve combined with spectrum imaging techniques were used to preliminarily predict reservoir thickness and lateral distribution;on the basis of above work,AVO,AVD.
Gasab block is a brachyanticline of Melut basin,Sudan.It belongs to southeastern fault of norther concave.It has many faults and assemble of rift system is complex.It is in the range of southwestern and souther sand body,which is rich and changes quickly.Gasab block is a complex fault block oil and gas field by this two factors.During the seismic date interpreation of Gasab block,the formation of interest is Eocene Yabus IV-VI,and it further investigate the structure and fracture feature.
In the seismic exploration,it is difficult for the seismic wave to transmit the shielding layer of high velocity,so it is difficult to acquire efficient seismic data of reflected wave from the stratum below the high velocity shield layer by the conventional methods.According to Snell law and Zoeppritz equation,the paper studies the rule of energy’s distribution of elastic wave on the interface,obtain the rule of received energy variation with offset or angle,and also study the relation of the exploding.
The detection of hydrocarbon potentials is to recognize the fluid type of reservoir directly by using the different seismic response of oil & gas strata from water layers or dry layers.Detection work can be carried out in two steps: recognition and tracking.Concrete techniques for hydrocarbon detection include seismic attributes and geological analysis,data decomposition,multiple attributes optimization and prediction by integrating various seismic attributes.There are 10 wells,including Shsh3.
Limited by various kinds of unfavourable factors such as the low quality of the seismic date,and quick variation of the velocity,the precision of highly steep complex mountainous region structure research in kuqa depression can not satisfy the demand of oil and gas exploration.On the basis of finding out the difficult point,continue tackling key problem of seismic acquisition and carry on the integrating of seismic date processing and interpretation.on the same time,chang method,utilizing seismic date.
Based on several case studies,this paper fully and systematically expatiates the objectives,technical solutions,inversion workflow and data quality control of reservoir prediction in seismic inversion.It regards rock property analysis as predication basis and provides that the feasibility study and pilot study must be done before inversion.Through the inversion,varied inversion data must be kept in consistency,and then some important issues was talked.The expectation is to provide an appropriate guide.
Sparse spike impedance inversion is one of the most popular impedance inversin.It is used in sandstone prediction using few wells.The methods turn out to be successful in YX area.
Light hydrocarbons can react by the means of free radicals.The double bonds of alkenes are easy to rupture.There is surplus bond force in solid surface,which can adsorb light hydrocarbons.When the sediment surfaces adsorb light hydrocarbons,it follows the theory of solid surface adsorption.Firstly,light hydrocarbons adsorbed physically,the molecule interval minish and the Vandwa force augment.Then the adsorbed bond C-H of alkyl hydrocarbons turn into Cand H,and the adsorbed bond.
Mercury is one of the most important toxic elements in oil and gases.Owing to the high volatize feature Hg tend to dispose into the air during combustion and therefore it results in the environmental pollution. The understanding of various chemical forms of mercury in hydrocarbon matrices has evolved due to technical advances.Accurate determinations of total mercury and speciation of mercury compounds in oil and gases depend on sophisticated sampling techniques and rigorous analytical procedures.
The geochemistry of formation water is a common way to trace the fluid flow and hydrocarbon accumulation.This paper focused on the space distribution of the geochemistry of the formation water in Songliao basin and its indication for the water-rock interaction processes.The Cl~――HCO~-_3 and Na~+-K~+-Ca~(2+) relationships show that the initial water-rock interaction was the dissolution of NaCl and calcium-bearing carbonate,which resulted in the increasing of Na~+-K~+-Ca~(2+)-Cl~-and salinity.The succeeding.
Heating and pressing simulation experiments of typical source rocks(type I-II_1,II_2 and III) of Zhu 1 depression are performed in the closed vacuum system.Peak stages of oil and gas generation and their generating ratios in different thermal evolvement stages have been studied.Also discussing modes of hydrocarbon generation and expellation,oil and gas affinity,hydrocarbon generation potential and TOC recovery coefficients of different source rocks in the different stages.The results of this paper provided.
In the period of Feixianguan, the northwest of Sichuan was a platform which was controlled by Longmen mountain island chain.Deposited in here was a set of grain carbonate and purplish red shale.Poor at the contend of organic carbon,it is impossible to be available for source rock.Based on the comprehensive study of gas chromatographic,carbon isotope and biomarker of the residual oil,it is believed that the oil is the product which was generate by argillaceous source rock of Cambrain.in oil-generation peak.
Natural gas produced in Malang sag of Santanghu basin features high hydrocarbon content and high drying coefficient,with carbon isotope relatively light of methane and heavy of ethane and propane,which meets the characteristics of bio-thermocatalytic transitional zone gas through comprehensive analyses.The organic matter in middle to upper Triassic and middle to lower Jurassic coal measure source rock,which is the major source rock of natural gas in the basin,is type Ⅲ,and at its transitional zone gas evolution.
According to outcrop data,the Jurassic source rocks were developed wide in Washixia depression,southeast of Tarim basin,and Ruocan 1 Well was one of the most important exploration wells in this area.By geochemical method,the nature gas origin was analysed and the source rocks in this area were evaluated on base of present data.The content of CH_4 in Well Ruocan 1 was fairly high,belonging to typical dry-gas;and isotope of C_2H_6 indicated its nonmarine origin,sourced from Jurassic coal-bearing rocks.
In the base of the evaluative criterion of the threshold value of organic abundance of carbonate rocks,this paper discussed thoroughly the evaluative problems of the value of organic abundance,Combined with the development characteristics of marine strata in middle Yangtze area,and from the point of view of source rock,we placed emphasis on analyzing the perspective of oil exploration of marine strata in this area.
The paper adopts some methods such as gas composition,carbon isotope,light hydrocarbon,middle-molecular hydrocarbon and biomarker toillustrate whole-hydrocarbon geochemical characteristics and genetics and possible source of oiland gas from Xujiahe group of Chuanzhong-Chuannan transitional belt.The result shows that oil and gas from Xujiahe group mainly comes from autogenic coal source rock,and bind is main.Genetics of natural gas is mainly mature humic mothermaterial,small condensate oil and crude oil.
The physical simulation study on the gas-drive multiphase flow mechanism of aquifer gas storage is different from that of routine gas-oil reservoir,it mainly solves the simulation of gas-drive flow mechanism of gas storage in the condiuion of repetitious injection-production,so from experiment design and flow,it has its particularity and complexity,and at present,it has few reports on the domestic and foreign papers.From independent design and study on the physical simulation experiment flow of aquifer gas.
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