亚诺斯前陆盆地MM油田成藏规律及成藏模式

MM油田位于南美洲哥伦比亚境内亚诺斯前陆盆地东部斜坡带,远离西部烃源灶,以微幅度、小规模岩性-构造油藏为主。本文通过研究亚诺斯盆地构造演化史并充分结合研究区地质、测井、地震等资料,总结出MM油田具有"远源复合输导,断层遮挡式成藏"的油气成藏规律,油气远源输导控制油藏丰度,构造位置控制油气聚集,断层侧向封闭控制油藏分布,圈闭大小及储层物性条件直接影响油藏规模。在研究区,卡沃内拉组C7段储层为油气侧向运移主要载体,断层为油气垂向运移主要通道,断层断距与盖层厚度之间的匹配关系及圈闭条件共同控制MM油田成藏模式,形成了断鼻、岩性-断层及断层-岩性等3种油藏类型。

Oil and Gas Pool-Forming Law and Reservoir Model of LIanos Foreland Basin

The MM oilfield is located in the eastern slope of LIanos foreland basin in Colombia , South America .It is made up of many micro amplitude ,small scale lithologic‐structural reservoirs far away from the western hydrocarbon source .A comprehensive analysis is conducted for the history of tectonic evolution of LIanos basin with full integration of geological logging and seismic data . The results show that the oil and gas pool was formed through “hydrocarbon migrated long distance through a complex transport system and accumulated by faults sheltered” .The long distance transport system controls abundance of reservoirs ,and lateral sealing faults control oil and gas distribution ,while the size of trap and reservoir physical properties directly affect the reservoir scale .In the study area ,for the hydrocarbon migration ,the C7 formation of Carbonera group is the main lateral passage ,and the faults are vertical passages .The matching relationship between the fault throw and the thickness of cap rock as well as the trap conditions jointly control MM oilfield reservoir model ,fault nose ,lithologic‐fault ,and fault‐lithologic reservoir types .