摘要
渤海海域渤东凹陷南洼凹陷区蓬莱C构造是以明化镇组为主要目的层系的复合型花状构造,油气富集规律不明确导致潜力砂体勘探效果存在差异.根据复合型花状构造形成机制,以断裂研究为中心,运用相干切片、油源对比、断—砂耦合面积计算等方法,分析蓬莱C构造砂体油气富集规律.结果表明,该构造受控于郯庐断裂带新构造运动,晚期走滑挤压强度较小,造成早期派生断层再次活动及地层产状变化,"花心"部位易发育双/多断型砂体;根据断—砂耦合油气丰度半定量预测模板,认为双/多断型砂体是油气高丰度区;沙河街组有机质形成环境与类型较好,为主力烃源岩,不同烃源岩层系对砂体含油丰度影响较小;在成藏条件配置关系基础上,预测蓬莱C构造切入沙河街组烃源岩的断层附近位于"花心"部位的浅层砂体为油气富集区,砂体高部位断—砂耦合程度对油气运聚具有积极意义.
Strong difference in oil abundance of sand bodies showed in Penglai C structure,which located in south sag of Bodong depression,Bohai sea,with main targets on Minghuazhen formation as a compound flower structure.Exploration of potential sand bodies differs due to the uncertainty of oil & gas accumulation rule.Based on study of formation mechanism,combined drilled wells data with coherence slice,oil-source correlation and fault-sand coupling,oil and gas enrichment of Penglai C structure was analyzed.Results showed the structure was formed by Neotectonism of Tanlu faults,weaker strike-slip intensity in late stage only re-active slip-deriving faults and change of stratigraphic attitude and doublefaulted and multi-faulted sands developed in the inner flower area could be potential area with high oil abundance by semi-quantitative prediction for oil &gas abundance using sand-fault coupling.Source rock in Shahejie formation generated and compelled more hydrocarbons due to better environment and types,and demonstrated that oil abundance could not be affected by differences between source rock layer series.Based on analysis of different combinations of reservoir forming factors,it was concluded that inner flower areas with long-lasting faults inserted into Shahejie formation could be potential of hydrocarbon enrichment in Penglai C structure,fault-sand coupling in higher position of sand was identified positive to migration and accumulation.
出处
《东北石油大学学报》
CAS
北大核心
2015年第4期38-44,7-8,共7页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2011ZX05023-006-002)
关键词
郯庐断裂
蓬莱C构造
油气运移
浅层砂体
断—砂耦合
渤东凹陷
Tanlu faults
Penglai C structure
oil and gas migration
shallow sands
fault-sand coupling
Bodong depression