The phase state and distribution rule could recognized clearly and its control factors could investigation, as a means of the PVT experimental data of 80 layers and the physical and chemical characters of these hydrocarbons produced from oil and gas pools in Kuqa petroleum system. The main type was gaseity and subordinative type was liquid in hydrocarbon fluid system in this system. The system divided two or three belts-south, middle and north, and two segments-east and west, and the north belt was rich.
In last two decades, with some oil and gas fields were discovered in Kucha foreland basin, more progress have been made on Kucha petroleum system. In this paper, the main geological characteristics about Kucha petroleum system are showed as follows: The Kucha petroleum system is composed of Triassic-Jurassic source rock which is characterized by Ⅲ-Ⅱ_(1) type kerogen from mudstone of lacustrine facies and coal beds-mudstone bearing high carbon of swamp facieses. Its energy fields are characterized by lower team.
After the necessary conditions for pressure increase by fluids charge were considered, it was proved that the Mesozoic reservoir in Kuche depression have the necessary conditions to increase its pressure by fluids charging. These necessary conditions are the collocation of gas generation and fluid compartment sealed in period, the collocations of the source rock and reservoir layers in space, the drainage system connecting the source and reservoir and the dynamics of charge.
Using experiment installation desigend and installed by ourselves, this paper simulated oil migration laws through fault. The results indicate that there is a direct proportion relation between the migration velocity of oil through fault and inclination angle of fault, there is an inverse proportion relation between the migration velocity of oil through fault and granules and mudston cotents of filling material in fault zone. Using simulation experiment, this paper studied the relation between the migration.
By the experiment study, the stress-sensitivity of low-permeability gas reservoirs is being existed objectively. And the hurt for reservoir’s permeability can’t be ignored. The permeability descend by the effective stress ascend, and descend range in earlier period is most significantly and gently in later period. But the permeability can not restore by descend the effective stress, so the hurt for permeability is permanence. Compare to the dry rock samples, the samples with irreducible water have more sign.
The exploration fields on the high temperature and high pressure situation about the mud diapir belts in Yinggehai basin, is a very important new exploration area which is the Chinese offshore oil and gas field paid a big attention to. A first exploration well drilled in near year not only unveiled the mystic purdah which covered on the exploration field to the middle-deep beds, but also unveiled the attractive virgin soil of this middle-deep beds. Especially important is that the drilling exploration had.
After many years exploration, it’s proved that source rocks of Wenchang and Enping formation are two sets of important source rocks developed in Wenchang A sag, where there is rich hydrocarbon resource with the characteristics of gas being accumulated in the center and oil being accumulated in the margin. The study shows that the play condition is excellent in the central uplift, downthrown block of eastern Zhu Ⅲ south fault, and northern slope of Wenchang A sag, and they are important fields for hydrocarbe.
To compare with the traditional log data comprehensive explanation and information disposing technique, BP artificial neural network method possesses great ability of adapting itself, learning itself in parameter prediction of reservoirs which have great nonhomogeneity and big progression error of physical parameters. By use of the wonderful nonlinear mapping ability, BP artificial neural network method can build accurately nonlinear model between reservoir parameters and log response.
Karst roles include chemical solution and mechanical erode and substantial movement and redeposition due to the reciprocity of water and rock, which are a synthetical geological role. The carbonate rocks of Ordovician in the Ordos basin suffered from sedimentary formation stage and solution destroy and solution fill and solution rebuilt since sedimentary matter started to deposit. Palaeokarst have all kinds of styles and the complicated fabric. The palaeokarst styles may divide into surface Palaeokarst.
Kongquehe area of Tarim basin is a favorable exploration area.In Kongquehe area, two sets of multiple source rocks developed in Cambrian-Ordovician, Jurassic, being as foundations for its hydrocarbon prospecting. This paper presents the analyses of stratum and sedimentary facies,source rock, reservoir,seal rock development, structural belt location, local structural development in them, structure-formed periods versus petroleum migration/accmulation, and oil-gas shows in drilled wells.
Through comprehensive analysis of lots of rock core, well logs, and seismic data, and combining the knowledge of reservoir geology, logging geology and seismic sequence, the reservoir anisotropism can be resolved effectively. Based on the analysis of single well microfacies, the reservoir character in the lower section of Minghuazhen formation has been studied. The results indicate that the Minghuazhen formation develops meandering river sedimentary system, which can be subdivided into six types of sediment.
Exploratory difficulty is increasing when lithologic reservoirs become main targets in anaphase exploration of oil field. The sandstone bodies can be drilled accurately, because of improvement of seismic geology interpret technology, but their oilness are different. In this paper variety of character of reservoir of Niu-35 sandstone body are anatomized, microscopic factors, which control the formation of lithologic reservoir, are discussed, such as contend of mud(ash), calcite, size of porosity.
A number of hydrocarbon source rocks are developed in Xiaocaohu sub-depression in Tuha basin, and condition of oil-resource is excellent, resource of natural gas is abundant, potential of exploration is huge; Three sets of reservoir-cap combinations are developed in mid-Jurassic; Natural Gas reservoir types in depression is mainly structure-lithology combination for J_2s-J_2q and deep-basin gas reservior for J_2x-J_1, and forming reservoir in Yanshan and Xishan periods.
Wenxi fault belts lies in the west of Wennan oilfield which lies in the central uplift of Dongpu depression. The structural area of Wenxi fault belts is about 80 km~(2). It’s major faults are north-east trending. Wenxi fault belts which has a good condition of oil and gas forming, lies to the east of Haitongji generative sag. The study on structural characters is a main content. This paper describes the characters of major faults in Wenxi fault belts, analyzes the structural types of major faults in Wenxi.
A new method of determining deliverability of gas reservoir is established in this work. The principle and the derived process are presented as follows: the Absolute Open Flow (AOF) potential of one-point method is first determined using the test data; then, the correction function of AOF is given based on the well deliverability testing data; The established relationship of AOF with flow coefficient leads to a generalized deliverability equation for the whole gas reservoir; the possible maximum and reasona.
Aimed at the various types of reservoir space in carbonate rock, the logging responses and adaptability,including full-borehole micro-resistivity scanner imaging logging and conventional logging are discussed. Based on this, self-adaptive quantitative method and models are proposed, such as porosity model, permeability model and saturation model. These method and models prove to be adaptive widely when they are applied in practical well data and the results are satisfying.
The Kuche foreland basin is an gas area of enrichment. By new, there have been found several large-scale gas fields, such as Kela 2, Dina 2 gas fields. The compositional and texture maturities of rocks are very low because of intensely tectonic movement and adjacent material resource. The reservoir is belong to low porosity and permeability with lithological mixture and sand-shale thin inter layers, add it, the area’s strata pressure coefficient variety big, mud invade serious.
Yaha gas condensate reservoir of the Tarim basin is the biggest gas condensate reservoir in developing in China. The gas condensate reservoir is a kind of specific and complicated gas reservoir; during the period of the development, the system of the condensate gas percolates with complex phase transition; when the formation pressure is lower than its dew point pressure, retrograde condensation will occur in the formation, the retrograde gas condensation will hurt the producing pay and make a reduction .
During natural gas producing, the analysis of micro-liquid hydrocarbon in gas reservior can help us to resolve the question of liquid hydrocarbon recovery under the groud condition. For exact result of phase analysis,we cannot ignore the effect to phase analysis of micro-liquid hydrocarban of gas reservior.
The macerals of the low-mature coal (R_o=0.40%, from Manjia’er Depression, Tarim Basin, China) were subjected to closed system pyrolysis, in sealed gold tubes, under isothermal temperature conditions, ranging from 250 to 550℃ at temperature intervals of 50℃ (72 hours/sample). The soluble organic matters from pyrolysis residues and original coal sample were obtained by chloroform extraction, including saturated, aromatic and non-hydrocarbon fractions. The results show that the liquid substance generation.
In this paper, the author discusses the gas-generating characteristics of the marlite and the shaly limestone by hydropyrolysis. It is directed that their gas-generating characteristics is relative to organic matter and mineral component of rocks.There is more methane,ethane, isobutane and isopentane in shaly limestone than in marlite.At middle and low temperature, there is more hydrogen, more nitrogen, higher dry coefficient and ratio of ethane content to propane’s in marlite than in shaly limestone. Hydro...
Different restoring methods of organic matter abundance of source rocks possess inspective advantages and disadvantages. But these methods are all restricted to realm of hydrocarbon-generating theory of kerogen degradation. The initial organic matter type,mean hydrogen/carbon ratio of hydrocarbon products, median expulsion efficiency from high mature source rocks and close extent of reaction system mainly affect restoration factor of organic matter abundance. These restoration coefficients of total organic ...
Hydrogen is a dominant element in organic matter. The research on hydrogen isotopic composition of organic matter is an important means to cognize the characteristics of organic matter generating hydrocarbon and the oil/gas-source correlation. This article systematically analyzes the research on hydrogen isotopic geochemistry characteristics of organism and its depositional evolving products (including organism, present sediment, kerogen, coal, oil and natural gas) in recent years.
The effect s of t ran sit ional m etals on the generat ion of hydrocarbon pyro lysised f rom o rgan ic\r\nm at ter are invest igated w ith sim u lat ion experim en t. The resu lt s show ed that the apparen t act ivat ion\r\nenergy as w ell as the temperatu re of the generat ion of hydrocarbon decrease in p resence of the t ran sit ional\r\nm etals. A t the sam e t im e, the p roduct compo sit ion changed and the con ten t of satu rat ion hydrocarbon\r\nincreased.
This paperm ainly int roduced geochemical characters of C and O iso tope. Using the sign if icance of these characters in the aspect of sediment environment, th is paper analyzed C and O iso tope ofQ ian jiang Saline lake and educed conclu sion s: there are good relat ivity betw een the change of clim ate and sedim ent\r\nenvironm en t and the con tent’s change of C and O iso tope from high to low; it is aobturated saline lake of\r\ninnerland tow ard Q ian jiang saline lake, and the con ten t of C and O iso tope was primarily decided that Ciso tope is - 5‰(PDB) and O isotope is - 2‰(PDB).
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