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Geological environment and prospective significance ofCretaceous gas reservoir in Well YHC1 of Yin’e Basin

Zhao Chun-chen,Liu Hu-chuang,Ren Lai-yi,Chen Zhi-jun,Li Ke-she,Bai Xiao-yin,Wang Xiao-duo   

  1. Research Institute of Shaanxi Yanchang Petroleum (Group)Co.,Ltd.,Xi’an 710075,China
  • Received:2016-11-25 Revised:2017-01-03 Online:2017-03-10 Published:2017-03-10

Abstract:

As the few large Paleozoic and Mesozoic superimposed sedimentary basin with multiple cycles and non-systematic exploration and exploitation,the breakthrough of Well YHC1 must lead a further exploration input to Yin’e Basin and promoted the new oil-gas discovery of new region and formation in Yin’e Basin which will become the future exploration aim.Combined with geology and geophysics,using quaternity of drilling and well logging,seismic data,palaeobiologies and geochemistry,it was the first time to do the research on geological environment of Cretaceous gas reservoir in Well YHC1 of Yin’e Basin.And especially we got the following important achievements and new understandings in stratigraphic distribution,tectonic development,source rocks feature,deposition and reservoir analysis,reservoir model and prospective significance:(1)There are two main targets formations,K of Cretaceous in Mesozoic and C-P of Upper Paleozoic.Cretaceous covers widely in this region and has big thickness.Hari and Guaizihu Depressions are the main development areas of it.Well YHC1 locates in the depositional center,which ensures the integrity of stratigraphic units in Cretaceous gas reservoir.(2)The tectonic framework shows alternate concave and convex feature.The faults are all normal and mostly centralized in the center of each depression.Fault-margin controls the whole tectonic framework and depositional systems of the research area and forms the NNE-strike half graben-like basin.The tectonic activity promotes the formation of reservoir space in fractured-cavernous mudstone of YHC1 Cretaceous gas reservoir.(3)In Cretaceous,Well YHC1 was always in a rich effective source rock region with good maturity and great hydrocarbon potential.And a large set of dark grey-black limy mudstone in Bayingebi Formation becomes an important foundation of this gas reservoir.(4)The Cretaceous depositional systems contain subaqueous fan,fan delta,braided river,braided river delta,lake and igneous faces.The preponderant depositional systems of Well YHC1 are semi-deep and deep lacustrine depositional systems which decide the transformation and preservation of organic materials and developmental environment of reservoir.(5)The exploratory data shows that during the period of Cretaceous,III and IV class reservoirs were occasional and V class (non)reservoir was the main type of Well YHC1.In view of this,we promptly change the exploration idea,expand the exploration object and bring limy or lime mudstone of Well YHC1 into exploration range.Through this bold attempt to fractured-cavernous special reservoir,we finally get the historical breakthrough.(6)The gas property of Bayingebi Formation in Well YHC1 is probably a system of carbonate mudstone with through cracks and dissolved vugs,belonging to special lithologic reservoir within source accumulation by inference.

Key words: Well YHC1, Cretaceous gas reservoir, Stratigraphic distribution, Tectonic development, Source rocks feature, Distribution of depositional system, Reservoir development, Prospective significance

CLC Number: 

  • TE121.3+1

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