准噶尔盆地东道海子凹陷二叠系平地泉组烃源岩特征及热演化史模拟  

Characteristics of source rocks and thermal evolution simulation of Permian Pingdiquan Formation in Dongdaohaizi Sag,Junggar Basin

作　　者：杨海波[1] 冯德浩 杨小艺 郭文建[1] 韩杨 苏加佳 杨皩 刘成林[2,3] YANG Haibo;FENG Dehao;YANG Xiaoyi;GUO Wenjian;HAN Yang;SU Jiajia;YANG Huang;LIU Chenglin(Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China;State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,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]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《岩性油气藏》2024年第5期156-166,共11页Lithologic Reservoirs

基　　金：中国石油天然气股份有限公司重大科技专项“中石油十四五油气资源评价”(编号:2023YQX201)资助。

摘　　要：基于钻井、录井、测井及烃源岩分析测试等资料,对准噶尔盆地东道海子凹陷二叠系平地泉组烃源岩的生烃潜力和热演化史进行了系统研究。研究结果表明:(1)准噶尔盆地东道海子凹陷二叠系平地泉组烃源岩主要为深灰色、灰黑色泥岩,颜色深且厚度普遍较大,自东北部斜坡区向凹陷中部厚度逐渐增大,并向西部莫索湾凸起逐渐减小,最大泥岩厚度可达536 m。(2)研究区平地泉组烃源岩有机质丰度综合评价为中等—极好,纵向上以平一段有机质丰度最高,平面上以凹陷东北部滴南7井区和滴南19井区最高;平地泉组有机质类型主要为Ⅱ_(2)—Ⅲ型,少部分为Ⅱ_(1)型,纵向上以平二段有机质类型最好,平面上凹陷区烃源岩有机质类型主要为Ⅱ_(1)—Ⅱ_(2)型。(3)热演化史模拟结果显示,凹陷区和斜坡区烃源岩分别在晚三叠世和晚侏罗世达到生烃高峰,现今分别处于高成熟阶段和成熟阶段。(4)研究区发育“下生上储”和“自生自储”2类油气藏,其中平地泉组烃源岩与上乌尔禾组储集层形成“下生上储”油气藏,平二段和平一段的优质烃源岩与湖盆边缘的小型扇三角洲沉积在平地泉组内部形成“自生自储”油气藏,二者油气勘探潜力均较大。Based on the data of drilling,mud-logging,wire-logging and source rock analysis and testing,the drocarbon generation potential and thermal evolution history of the source rocks of the Permian Pingdiquan Formation in Dongdaohaizi Sag of Junggar Basin were systematically studied.The results show that:(1)The hydrocarbon source rocks of the Permian Pingdiquan Formation in Dongdaohaizi Sag of Junggar Basin are mainly dark-gray and gray black mudstones,which are dark in color and generally large in thickness.The thickness gradually increases from the northeastern slope area to the center of the sag,and gradually decreases toward the western Mosuowan uplift,with a maximum thickness of 536 m.(2)The organic matter abundance of the source rocks of Pingdiquan Formation in the study area is evaluated as medium to excellent levels,with the highest organic matter abundance in the first member of Pingdiquan Formation in the vertical direction and in Dinan 7 and Dinan 19 well areas in the northeast of the sag on plane.The organic matter type is mainly typeⅡ_(2)-Ⅲ,with a few typeⅡ_(1),and it is the best in the second member of Pingdiquan Formation in the vertical direction.The organic matter type of source rocks near the central sag is mainly typeⅡ_(1)-Ⅱ_(2) on plane.(3)The simulation results of thermal evolution history show that the source rocks in the sag and slope areas reached their hydrocarbon generation peaks in the Late Triassic and Late Jurassic,respectively,and are currently in the high mature stage and mature stage,respectively.(4)There are two types of hydrocarbon accumulation models in the study area:“lower-generation and upper-reservoir”and“self-generation and self-reservoir”.The source rocks of Pingdiquan Formation and the reservoirs of the Upper Urho Formation form“lower-generation and upper-reservoir”reservoirs,while the high-quality source rocks of the first and second members of Dingdiquan Formation and the small-scale fan delta deposits at the edge of the lake basin form“self-generation

关 键 词：烃源岩 高有机质丰度 生烃潜力 热演化史模拟 下生上储 自生自储 平地泉组 二叠系 东道海子凹陷 准噶尔盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]