四川盆地北部须家河组“断缝体”气藏特征及勘探意义  

Characteristics of Xujiahe Formation fault-fracture reservoirs in the northern Sichuan Basin and its exploration significance

作　　者：王威[1] 凡睿[1] WANG Wei;FAN Rui(SINOPEC Exploration Company,Chengdu 610041,China)

机构地区：[1]中国石化勘探分公司

出　　处：《成都理工大学学报（自然科学版）》2019年第5期541-548,共8页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05002-004)

摘　　要：综合利用钻井、录井、测井及地球物理等资料,研究四川盆地北部马路背地区上三叠统须家河组储集体及气藏特征。研究区须家河组发育一种新的储集体类型,由断层、褶皱伴生破裂缝叠合基质孔形成的不沿层状分布的规模网状缝孔储渗体(简称“断缝体”),天然气在断缝体内富集即为“断缝体”气藏,主要表现“双源供烃、立体输导、复式聚集、断缝富集”特点。结合典型高产稳产井解剖,确定“断缝体”气藏高产富集主要受3个因素控制:①海相、陆相优质烃源岩双源供烃,烃源充足;②切源断裂输导体系提供有效的运移通道;③网状缝孔储渗体提供大规模的油气赋存场所,是“断缝体”气藏富集与高产的关键。On the basis of comprehensive analyses of drilling holes,well logging and geophysics,the characteristics of Upper Triassic Xujiahe Formation reservoir and gas reservoir in the Malubei area of Sichuan Basin are studied.It is proposed that the Xujiahe Formation in the study area developed a new type of reservoir with composite matrix porosity,which is composed of anastomosed fractures resulted from superposition of fault and fractures and associated with faults and folds.When the fault-fracture body is filled with gas,the fault-fracture gas reservoir is formed,which is characterized by dual hydrocarbon sources,stereoscopic migration of gas,multiple accumulation and fault-fracture storage.Investigation of typical high-yield wells reveals that the high yield and enrichment of the fault-fracture gas reservoirs are controlled by three factors.Firstly,the hydrocarbon supply of both marine and continental quality source materials is the foundation for the formation of fault-fracture gas reservoir.Secondly,the faults and fractures cutting through the conducting system provide effective migration path for the gas.Finally,the anastomosed fractures occurred in the reservoir permeable body provides large scale storage space for oil and gas.

关 键 词：断缝体 气藏 主控因素 须家河组 四川盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]