伊通盆地莫里青断陷双一段油气分布特征及控制因素

DISTRIBUTION PATTERN AND CONTROLLING FACTORS OF HYDROCARBON IN THE 1st MEMBER OF SHUANGYANG FORMATION IN THE MOLIQING RIFT,YITONG BASIN

基于对伊通盆地莫里青断陷测井、试油等资料的分析及前人研究成果,总结了莫里青断陷双一段油气分布特征,并结合构造、沉积的发育特征,分析了双一段油气分布的控制因素。莫里青断陷双一段油气纵向上主要分布在下部的Ⅱ砂组,平面上油气主要沿断裂在靠山凹陷东西两侧分布。从西北边界到生烃凹陷向东南缘,油气藏类型主要为岩性、断层以及断层—岩性复合型油气藏。双一段油气分布主要受断层、沉积相带以及不整合面分布的控制,不同的构造单元影响因素也各有区别。

The Moliqing Rift,located at the southernmost corner of the Yitong Basin,is a second-order tectonic unit of the basin.Upon the logging and oil production data and previous studies,the oil and gas distribution pattern in the 1st Member of the Shuangyang Formation are summarized.There oil and gas mainly occur in the Lower Sand Group Ⅱ of the 1st Member,and are distributed along the faults on the east and west sides of the Kanshan Sag in a plane view.From the northwest boundary to the southeast border of the hydrocarbon-generation depression,there are three primary types of reservoirs,i.e.fault-sealed,lithology-sealed and complex reservoirs.The distribution of oil and gas depends mainly upon the distribution patterns of unconformities,faults and lithofacies,and the dominating factors vary in different tectonic units.