CAJ | 학술논문

楚雄盆地自下寒武统至白垩系,在多处发现油气苗和沥青显示.研究认为,导致洒芷古油藏破坏的主要因素是晚期构造隆升与大幅度的剥蚀,它们使得古油气藏暴露地表;晚期挤压冲断伴生的张性破裂缝窜通地表,使油气散失也是一个不可低估的破坏因素.油藏孔隙类型主要有两种:下部主要为原生型孔隙(上三叠统);上部主要为裂缝型孔隙(侏罗系).下部的孔隙型沥青是早期成藏的岩性 -地层油气藏的残迹.这说明斜坡区、隆起区是油气运移的长期指向区,有利于古岩性-地层油气藏的形成.
초웅분지자하한무통지백성계,재다처발현유기묘화력청현시.연구인위,도치쇄지고유장파배적주요인소시만기구조륭승여대폭도적박식,타문사득고유기장폭로지표;만기제압충단반생적장성파렬봉찬통지표,사유기산실야시일개불가저고적파배인소.유장공극류형주요유량충:하부주요위원생형공극(상삼첩통);상부주요위렬봉형공극(주라계).하부적공극형력청시조기성장적암성 -지층유기장적잔적.저설명사파구、륭기구시유기운이적장기지향구,유리우고암성-지층유기장적형성.
Oil and gas seepages and asphalt shows are not rate from the Lower Cambrian to the Cretaceous in the Chuxiong Basin.An analysis of Sazhi plaeo-reservoirs in the basin reveals that they were destroyed mainly because of surface exposure caused by later structural uplifting and large-scale erosion.Extensional fractures induced by later compression and thrusting connected the reservoirs with the surface and therefore also contributed a lot to the destruction of the reservoirs.There are two types of reservoir space.One is original pores which dominate the lower part of the reservoir (the Upper Triassic),and the other is fractures which are predominant in the lower part of the reservoir (the Jurassic).Bitumen occurring in the pores of the lower reservoir interval is believed to be the remnant of early-formed lithologic-stratigraphic reservoirs,indicating that the slope and uplift zones are the favorable places for the formation of paleo-lithologic-stratigraphic reservoirs as they are regarded as the final destination of oil and gas migration.