吉木萨尔凹陷二叠系芦草沟组一段沉积期古地貌特征及有利储层分布  

Paleogeomorphology and favorable reservior distribution of the first member of Permian Lucaogou Formation in Jimsar Sag

作　　者：邓远 陈轩[2] 覃建华[1] 李映艳[1] 何吉祥 陶鑫 尹太举[2] 高阳 DENG Yuan;CHEN Xuan;QIN Jianhua;LI Yingyan;HE Jixiang;TAO Xin;YIN Taiju;GAO Yang(Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China;School of Geosciences,Yangtze University,Wuhan 430100,China;Shenzhen Branch,CNOOC China Limited,Shenzhen 518000,Guangdong,China)

机构地区：[1]中国石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [2]长江大学地球科学学院,武汉430100 [3]中海石油(中国)有限公司深圳分公司,广东深圳518000

出　　处：《岩性油气藏》2024年第1期136-144,共9页Lithologic Reservoirs

基　　金：国家自然科学基金项目“吉木萨尔凹陷芦草沟组页岩油甜点沉积动力过程模拟”(编号:42072119);中国石油股份公司重大科技专项“陆相中高成熟度页岩油勘探开发关键技术研究与应用”(编号:2019E-26);中国石油集团重大科技专项“吉木萨尔页岩油国家级示范区水平井效益开发关键工程技术集成与试验”(编号:2020F-50)联合资助。

摘　　要：依据岩心、测井及地震等资料,对吉木萨尔凹陷二叠系芦草沟组一段沉积期古地貌进行了恢复,并预测了其有利储层分布。研究结果表明:①吉木萨尔凹陷芦草沟组一段发育丰富的粒序层理、块状层理、爬升沙纹层理及植物碎片,频繁出现的对偶粒序及内部侵蚀面沉积构造为湖泊异重流成因,进一步识别出水道、水下天然堤、朵叶体及侧缘4种微相类型,其中水道和朵叶体为有利储集微相。②芦草沟组一段沉积期,吉木萨尔凹陷古地貌整体呈“南低北高、中部低东西高”的沉积格局,低部位发育古沟槽、古低凸起及古低洼3类微古地貌单元。古沟槽内水道储层为加积叠置、厚层状充填,古低洼区内朵叶体为进积—侧积叠置、薄层席状披覆,古低凸起分割异重流沉积;古斜坡区异重流欠发育。③吉木萨尔凹陷南部发育3个异重流供给水道区。异重流水道向北进积,主水流线分散成多支,在水道末端形成多个连片叠置的朵叶体。Based on core,logging and seismic data,the paleogeomorphology of the first member of Permian Lucao-gou Formation in Jimsar Sag was restored,and the distribution of favorable reservoirs was predicted.The results show that:(1)The reservoirs of the first member of Lucaogou Formation in Jimsar Sag are rich in the sedimentary structures of massive bedding,climbing ripple bedding and plant clasts,and inversely-graded lower part and normally-graded upper part with internal scour surface,which can be interpreted as the origin of lacustrine hyperpycnite.The main microfacies are channel,levee,lobe and margin,among which channel and lobe are favorable reser‐voirs.(2)During the depositional period of the first member of Lucaogou Formation,the paleogeomorphology of Jimsar Sag showed a pattern of“low in the south and high in the north,and low in the middle and high in the east and west”.Three kinds of micro-paleogeomorphology units developed in low position:paleo-groove,paleo-low uplift and paleo-platform.In the paleo-groove,the reserviors present a stacking pattern of aggradation and thick layer filling.The reserviors in palaeo-platform are progradational and lateral stacking pattern with thin layer sheet distribution.The paleo-low uplifts separate the hyperpycnite lobes.The paleo-slope area is lack of hyperpycnite.(3)There are three hyperpycnal channles in southern Jimsar Sag.The channels prograde northward,and the main channles are dispersed into multiple branches,forming multiple overlapping lobes at the end of channles.

关 键 词：古地貌 页岩油 异重流 朵叶体 水道 芦草沟组 二叠系 吉木萨尔凹陷 

分 类 号：TE121.3[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]