迪北气藏致密砂岩储集层裂缝发育特征及其对成藏的控制作用  

Fracture Characteristic and Its Contribution to Hydrocarbon Accumulation in Tight Sandstone Reservoir in Dibei Gas Pool in Kuqa Depression, Tarim Basin

作　　者：魏红兴[1] 谢亚妮[1] 莫涛[1] 王佐涛 黎立[1] 史玲玲[1] 

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《新疆石油地质》2015年第6期702-707,共6页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05003-004)

摘　　要：迪北气藏位于库车坳陷东部,其储集层为侏罗系阿合组致密砂岩。通过对侏罗系露头剖面的观测、岩心描述以及岩心薄片分析的统计,确定了迪北气藏致密砂岩储集层储集空间以粒间溶蚀孔隙为主,同时发育大量的裂缝。通过对露头裂缝的描述与统计,认为裂缝发育程度受区域位置、岩性、砂体厚度、构造应力强度等作用影响。对该区致密砂岩岩心开展气驱水实验,表明在致密储集层中裂缝能够显著提高气体的成藏充注效率,在裂缝发育区含气饱和度较高,控制了迪北气藏天然气的富集。Dibei gas pool is located in eastern Kuqa depression, its reservoir rock is tight sandstone of the Jurassic Ahe formation. This pa- per makes observation of the Jurassic outcrop section, description of the drilling core, and statistics of the casting thin-section analysis data, and then determines that the reservoir space is dominated by intergranular dissolution pores and a lot of fractures in this reservoir rock. Through description and statistics of the outcrop fractures, it suggests that the fracture-developed degree is controlled by the regional location, lithology, sand body thickness, and tectonic stress intensity, etc. The gas drive water experiment on the tight sandstone cores indicates that fractures can greatly improve the charging efficiency of gas accumulation, thus forming higher gas saturation in fracture-developed area, and controlling the natural gas enrichment of Dibei gas pool.

关 键 词：塔里木盆地 库车坳陷 迪北气藏 致密砂岩 裂缝 气驱水实验 含气饱和度 

分 类 号：TE112.23[石油与天然气工程—油气勘探]