摘要
针对准噶尔盆地玛湖凹陷东斜坡夏子街组勘探程度较低、源外斜坡区成藏的特点,通过YB1井三维地震工区的钻井成果、精细构造解释、岩心描述及储层微观特征等综合分析,探讨油气成藏规律,研究下步勘探方向。结果表明:玛湖凹陷东斜坡发育的MD3、MD2、MD2北3个长期继承性的鼻隆构造带是油气聚集有利区,扇三角洲平原、前缘亚相的有效砂砾岩体为储集层,佳木河组与夏子街组之间的不整合面和油源断裂为油气输导体系,夏子街组上部的局部砂质泥岩和泥岩盖层是有效油气盖层。成藏模式为风城组烃源岩生成的油气沿不整合面横向运移,然后经断裂、微裂缝垂向运移,形成构造、构造—岩性、地层油藏。研究区邻近生烃凹陷的扇三角洲前缘相砂岩发育区为最有利勘探区,南部的扇三角洲平原相砂砾岩发育区为较有利勘探区。
In view of low exploration degree and hydrocarbon accumulation in the slope area outside source rock of Xiazijie Formation in east slope of Mahu Sag in Junggar Basin,through comprehensive analysis of drilled results,fine structural interpretation,core description and reservoir microscopic features of 3D seismic work area of Well YB1,the hydrocarbon accumulation laws are discussed,and the next exploration direction is studied. The results show that 3 long-term inherited nose uplift structural belts of MD3,MD2 and North MD2 developed in east slope of Mahu Sag are favorable hydrocarbon accumulation areas,effective glutenite bodies of fan delta plain and front subfacies are reservoirs,unconformity and oil source faults between Jiamuhe and Xiazijie formations are hydrocarbon transporting systems,and local sandy mudstone and mudstone caprock in the upper part of Xiazijie Formation are effective caprocks. Accumulating pattern is that hydrocarbon generated in Fengcheng Formation source rock of Mahu Sag migrates laterally along the unconformity,then vertically through the faults and micro-fractures and finally form structural,structural-lithologic and stratigraphic reservoirs. The most favorable exploration area is the fan-delta front sandbody adjacent to the hydrocarbon generating sag in the study area,and the fan-delta plain glutenite in the south is the secondary favorable exploration area.
作者
张永波
佟莹
王东学
马红妮
谭建华
ZHANG Yongbo;TONG Ying;WANG Dongxue;MA Hongni;TAN Jianhua(Luliang Field Operation District of PetroChina Xinjiang Oilfield Company,Karamay 834000,China;Xinjiang Haodeng Technology Company Ltd,Urumqi 830000,China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2022年第4期12-19,共8页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项“新疆北部深层区域构造格架、沉积演化与有利区带评价”(2017ZX05008006-003-001)。
关键词
成藏条件
成藏模式
有利勘探区
夏子街组
玛湖凹陷东斜坡
准噶尔盆地
hydrocarbon accumulation condition
accumulation pattern
favorable exploration area
Xiazijie Formation
east slope of Mahu Sag
Junggar Basin
