Fracture development characteristics and its relation with gas content of Shanxi Formation coal measure strata in southern Qinshui Basin

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  • 1.School of Energy Resources,China University of Geosciences,Beijing 100083,China;
    2.Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism,Ministry of Education,
    China University of Geosciences,Beijing 100083,China;
    3.Key Laboratory for Shale Gas Exploitation and Assessment,Ministry of Land and Resources,China University of Geosciences,Beijing 100083,China;
    4.Research Institute of Petroleum Exploration and Development of Huabei Oilfield Company,PetroChina,Renqiu 062552,China;
    5.College of Mining and Safety Engineering,Yibin University,Yibin 644000,China;
    6.PetroChina Research Insititute of Petroleum Exploration and Development,Beijing 100083,China

Received date: 2016-02-09

  Revised date: 2016-04-01

  Online published: 2019-09-10

Abstract

Gas logging abnormal phenomenon is extremely common of the sea-land transition phase clastic rock in the Upper Palaeozoic in the Southern Qinshui Basin.The good gas shows in tight sandstone and mudstone intervals are closely related to the degree of fracture development,this kind of gas reservoir should be defined as fracture clastic rock reservoir.Being influenced by special tectonic evolution and complicated diagenesis,the fracture development characteristics in the clastic rock strata have certain particularity and complexity,and the research degree is shallow.Based on the present research situation,comprehensive utilization of drilling,cores,logging,fracturing tests,slice and mechanics test data of clastic rock strata of Shanxi Fm.,comprehensive research of fracture development characteristic in this region has been carried out.Results show that the clastic rock formation has generally experienced strong compaction and cementation,its porosity is generally lower than 5%.The existence of fractures can significantly improve the connectivity between different types of pores,which can significantly improve the reservoir property,especially improve the ability of seepage properties.Sandstones mainly develop structural fractures,including tensile fractures,shear fractures and a small amount of extrusion fractures,non-structural fractures mainly include dissolution fractures;structural fractures,non-structural fractures are developed both in mudstones,with structural fractures including shear fractures and a small amount of extensional fractures and slippage fractures,non-structural fractures includes bedding fractures,dissolution fractures and diagenetic shrinkage fractures.Fractures are much more developed in sandstones than in mudstones.Fractures of clastic rock in the purpose layer are given priority to medium-low angle fractures and the fractures filling type is given priority to unfilled and half-filled fractures,these fractures are effective.The good fracture effectiveness is closely related to the special tectonic evolution characteristics of this region,The strong uplift and denudation in Himalayan period has had intense transformation on the coal measures strata.Significantly unloading of stress,strong reducing of formation temperature and the generation of a dependent tensile variable,on one hand,can make the originally closed fractures reopen;on the other hand,some new tensile fractures can produce.This is the important reason that tensile fractures are developed in the clastic rock strata.These extensional fractures’ formation period is late,which are mostly unfilled.That strengthen the fine interpretation of fracture development zone and the accurate prediction of fracture development “dessert” area have realistic significance in the breakthrough of fracture tight clastic rock gas reservoirs.

Cite this article

Yin Shuai, Ding Wen-long, Liu Jian-jun, Wang Peng, Sun Yuan-hui, Cao Xiang-yu, Wang Xing-hua . Fracture development characteristics and its relation with gas content of Shanxi Formation coal measure strata in southern Qinshui Basin[J]. Natural Gas Geoscience, 2016 , 27(10) : 1855 -1868 . DOI: 10.11764/j.issn.1672-1926.2016.10.1855

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