吐哈盆地北部山前带中下侏罗统水西沟群成藏条件及勘探方向  

Reservoir forming conditions and exploration prospect of Middle-Lower Jurassic Shuixigou group in northern piedmont belt of Turpan-Hami Basin

作　　者：吴青鹏[1] 杨占龙[1] 姚军[1] 袁成 张晶[1] WU Qingpeng;YANG Zhanlong;YAO Jun;YUAN Cheng;ZHANG Jing(PetroChina Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730020,China)

机构地区：[1]中国石油勘探开发研究院西北分院,兰州730020

出　　处：《岩性油气藏》2021年第6期1-11,共11页Lithologic Reservoirs

基　　金：国家油气重大科技专项“岩性地层油气藏区带、圈闭有效性评价预测技术”(编号:2017ZX05001-003)资助。

摘　　要：为研究吐哈盆地北部山前带中下侏罗统水西沟群成藏条件及勘探方向,开展了轻、重矿物物源分析、构造建模、烃源岩评价等研究。结果表明:①西山窑组二段沉积前北部山前带水西沟群受南物源体系控制,辫状河三角洲各类成因砂体发育;②吐哈盆地北部山前带可划分为冲断带、背斜带和斜坡带,其中冲断带可进一步划分为上盘冲断叠加体和下盘掩伏带,逆冲断裂带下盘掩伏背斜构造发育,且成排成带分布,山前带经历了3期滑脱两期冲断的构造演化过程;③山前带伊尔希土组、桃东沟群、三工河组烃源岩系均具备生烃条件,推测掩伏带下背斜、断背斜等构造圈闭烃源条件具备。综合评价认为山前带掩伏背斜构造群是吐哈盆地山前带下步油气勘探的方向。A series of studies,such as source analysis of both the light and heave materials,tectonic modelling and hydrocarbon source rock evaluation,have been carried out to investigate the forming conditions and explora‐tion prospect of Shuixigou group in northern piedmont belt of Turpan-Hami Basin.The research results suggest that:(1)Shuixigou group in north piedmont belt was once dominated by the south source system before the sedi‐mentation of Xishanyao formation.Sand-bodies generated by braid delta are well developed.(2)North piedmont belt of Turpan-Hami basin can be divided into three parts:thrust belt,anticline belt,and slope belt.The thrust belt can also be further divided as a thrust-superimposed body in hanging wall and underlying belt in footwall.Underlying anticlines are developed in the thrust fault zone of footwall,distributed in both rows and belts.Pied‐mont belt in this area goes through multiple tectonic evolution stages,including three sliding and two thrusting phases.(3)Source rocks in Yierxitu,Taodonggou,and Sangonghe formations show the ability of hydrocarbon generation,indicating a potential in the tectonic traps such as anticlines beneath the underlying belts,faulted anticlines and et al.We finally conclude that the tectonic group of underlying anticlines in the piedmont belt can be a promising target for oil&gas exploration in Turpan-Hami Basin.

关 键 词：北部山前带 水西沟群 物源 构造模型 生烃条件 勘探方向 吐哈盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]