Reservoir characteristics and controlling factor of tight sandstone in Shuixigou Group in Taibei depression,Turpan-Hami basin  

作　　者：Tong Lin Xuan Chen Fan Yang Hongguang Gou Mingyu Liu Runze Yang 

机构地区：[1]PetroChina Research Institute of Petroleum Exploration&Development,Beijing,100083,China [2]Research Institute of Exploration&Development,PetroChina Tuha Oilfield Company Hami,Xinjiang,839009,China [3]China University of Geosciences(Beijing),Beijing,100083,China

出　　处：《Energy Geoscience》2024年第2期70-80,共11页能源地球科学（英文）

基　　金：funded by the National Natural Science Foundation of China(No.U22B6002);the“14th Five-Year”Forward-looking Basic Science and Technology Project of China National Petroleum Company Limited(No.2022DJ2107).

摘　　要：The positive structure belts surrounding the Taibei Sag,Turpan-Hami Basin,have been the main targets for oil and gas exploration for years and are now left with remaining resources scattering in reservoirs adjacent to source rocks in the sag,where the Shuixigou Group with substantial oil and gas potential constitutes the primary focus for near-source exploration.Consequently,characterization of development and key controlling factors of reservoir space becomes a must for future exploration in the area.This study investigates the development traits,genesis,and controlling factors of the Xishanyao and Sangonghe formations in the Shengbei and Qiudong Sub-sags of the Taibei Sag with techniques such as cast thin-section observation,porosity and permeability tests,high-pressure mercury injection,and saturation fluid NMR analysis of reservoir rocks.The findings reveal that the Shuixigou Group in the Taibei Sag consists of lithic sandstone.Reservoirs in the group are mostly poor in terms of physical properties,with undeveloped primary pores dominated by intergranular dissolved pores as a result of a strong compaction.Comparative analysis of key controlling factors of the Sangonghe Formation reveals significant distinctions in sandstone particle size,sand body thickness,genesis and distribution,provenance location,and source rock type between the Qiudong area and Shengbei area.Vertically,the coal seams of the Xishanyao Formation exhibit heightened development with shallower burial depth and lower maturity compared to those of the Sangonghe Formation.Consequently,this environment fosters the formation of organic acids,which have a stronger dissolution effect on minerals to develop secondary dissolution pores,and ultimately resulting in better reservoir physical properties.Overall,the reservoirs within the Qiudong area of the Taibei Sag demonstrate superior characteristics compared to those in the Shengbei area.Furthermore,the reservoir physical properties of the Xishanyao Formation are better than those of the Sangonghe Fo

关 键 词：Intergranular dissolved pore Organic acid dissolution Secondary dissolution pore Tight sandstone Shuixigou group Turpan-Hami basin 

分 类 号：P618.13[天文地球—矿床学]