台北凹陷下侏罗统致密砂岩气成藏条件与勘探方向  

Accumulation Conditions and Exploration Direction of Lower Jurassic Tight Sandstone Gas Reservoirs in Taibei Sag

作　　者：陈旋 王居峰[2] 肖冬生 刘俊田 苟红光 张华[1] 林霖 李宏伟 CHEN Xuan;WANG Jufeng;XIAO Dongsheng;LIU Juntian;GOU Hongguang;ZHANG Hua;LIN Lin;LI Hongwei(Research Institute of Exploration and Development,Tuha Oilfield Company,PetroChina,Hami,Xinjiang 839009,China;Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China)

机构地区：[1]中国石油吐哈油田分公司勘探开发研究院,新疆哈密839009 [2]中国石油勘探开发研究院,北京100083

出　　处：《新疆石油地质》2022年第5期505-512,共8页Xinjiang Petroleum Geology

基　　金：中国石油前瞻性基础性技术攻关项目(2022DJ8107)。

摘　　要：吐哈盆地下侏罗统油气资源潜力大,剩余资源量多,已发现的油气藏主要分布于台北凹陷胜北洼陷和丘东洼陷周边的正向构造带,以构造油气藏为主,洼陷腹部油气勘探研究程度低。基于对已知油气藏的解剖,对台北凹陷三大富烃洼陷的沉积体系、烃源岩、储集层和成藏条件开展系统研究。结果表明,台北凹陷水西沟群煤系烃源岩广泛发育,与辫状河三角洲砂岩大面积接触,利于形成近源致密砂岩气藏。下侏罗统发育圈闭型和连续型2类致密砂岩气藏,其中洼陷腹部是连续型致密砂岩气成藏的有利区,勘探应由源边正向构造转向富烃洼陷,由源上常规油藏向近源(源内)致密砂岩气藏转变,胜北洼陷和丘东洼陷腹部具备形成大气藏的条件,是下侏罗统近源大面积致密砂岩气藏勘探的有利区域。The Turpan-Hami basin has great potential of oil and gas resources in the Lower Jurassic strata,with a large quantity of remaining resources.The discovered oil and gas reservoirs are mainly distributed in the positive structural belts around the Shengbei and Qiudong subsags in the Taibei sag,and they are primarily structural reservoirs.Less researches on the oil and gas resources in the hinterland of the subsags have been performed.Based on the dissection of known reservoirs,a systematic study was carried out on the depositional system,source rock,reservoir rock and accumulation conditions of three major hydrocarbon-rich subsags in the Taibei sag.The results show that the coal-measure source rocks are widely developed in the Shuixigou group in the Taibei sag and are in broad contact with the braided river delta sandstones,which is conducive to the formation of near-source tight sandstone gas reservoirs.There are two types of tight sandstone gas reservoirs in the Lower Jurassic,namely,trap-type and continuous-type.The hinterlands of the subsags are favorable areas for the formation of continuous-type tight sandstone gas reservoirs.Therefore,the exploration should be switched from the source-edge positive structure to the hydrocarbon-rich subsag,and from the above-source conventional oil reservoirs to the in/near-source tight sandstone gas reservoirs.The hinterlands of the Shengbei and Qiudong subsags have the conditions to form large gas reservoirs,so they are favorable areas for exploring near-source tight sandstone gas reservoirs in the lower Jurassic.

关 键 词：吐哈盆地 台北凹陷 致密砂岩气藏 生烃洼陷 下侏罗统 油气成藏条件 勘探潜力 

分 类 号：TE122.1[石油与天然气工程—油气勘探]