摘要
通过对鄂尔多斯盆地镇泾地区三叠系延长组的烃源岩条件、储层条件、储盖组合及圈闭类型等方面进行分析,认为镇泾地区延长组成藏条件优越。油气成藏控制因素及富集规律研究成果表明:构造演化控制着油气的调整方向,成藏期油气向SE方向运移,现今油藏向NE方向调整运移。烃源岩的有机质丰度分布控制着油气成藏,烃源岩有机质丰度>1%的地区,成藏条件优越。有利沉积相带控制油气富集,三角洲前缘亚相水下分流河道距离生烃灶近,砂体物性好、厚度大,是石油富集的最有利场所。成藏期流体动力差控制着油气的运移方向,流体动力差越大的地方,油气越富集。断裂对油气富集起着运移通道的作用,断裂导致的增孔作用进一步影响着油气富集。
It is concluded that there are favorable conditions for oil accumulation in Zhenjing Area through the detailed analysis of many aspects of the Upper Triassic Yanchang Formation in Ordos Basin,such as hydrocarbon source conditions,reservoir conditions,reservoir-cap rock combination and the type trap.The research results of the controlling factors of oil reservoirs and the enrichment regularity indicate that the tectonic evolution controls oil reservoir adjusting direction,old oil reservoir migrates to the north-east direction.Organic matter abundance distribution of hydrocarbon source rocks controls the oil accumulation.The area where the organic matter abundance is more than 1 percent has favorable conditions for oil accumulation.The favorable deposit belts control the enrichment of oil and the underwater distributary channel of deltaicfront subfacies are close to hydrocarbon sources,and have better sand body physical properties and a large thickness,making it a favorable site for the accumulation of petroleum.The dynamic reduction of fluid controls the migration direction of petroleum in reservoring time.The bigger the dynamic reduction of fluid is,the more petroleum will be accumulated.The fracture serves as the migration channels for the hydrocarbon enrichment,and the porosity increasing caused by the fracture will further affect the hydrocarbon enrichment.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第2期79-83,12,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项"中西部重点盆地碎屑岩领域油气富集规律与分布预测"(2008ZX05002-006)
关键词
鄂尔多斯盆地
延长组
油气成藏
成藏条件
主控因素
油气富集
Ordos Basin
Yanchang Formation
reservoir form ation
oil accumulation conditions
controlling factor
hydrocarbon accumulation
