CAJ | 학술논문

姬塬地区是鄂尔多斯盆地重点油气勘探区域之一。系统研究姬塬地区长2油藏的烃源岩、储集层、油气运移以及油气圈闭条件等,并综合分析了长2油藏的油气成藏条件。研究结果表明：姬塬地区紧邻盆地延长组生烃中心,油气供应充分,长2油藏的油气主要来自长7烃源岩;主要储层是水下分流河道砂体,岩石成分以长石砂岩、岩屑长石砂岩为主,极少量长石岩屑砂岩,为近中孔隙度、低渗透率储层;成岩作用类型主要有压实作用、胶结作用、溶蚀作用等。长7地层产生的异常高压是长7烃源岩产生的油气自下而上运移到长2地层的主要驱动力。研究区长2油藏的圈闭主要是构造-岩性圈闭,局部地区发育有构造圈闭和岩性圈闭。长2地层发育厚度较大的分流间湾泥岩均充当了长2油藏必备的遮挡和封盖层。
희원지구시악이다사분지중점유기감탐구역지일。계통연구희원지구장2유장적경원암、저집층、유기운이이급유기권폐조건등,병종합분석료장2유장적유기성장조건。연구결과표명：희원지구긴린분지연장조생경중심,유기공응충분,장2유장적유기주요래자장7경원암;주요저층시수하분류하도사체,암석성분이장석사암、암설장석사암위주,겁소량장석암설사암,위근중공극도、저삼투솔저층;성암작용류형주요유압실작용、효결작용、용식작용등。장7지층산생적이상고압시장7경원암산생적유기자하이상운이도장2지층적주요구동력。연구구장2유장적권폐주요시구조-암성권폐,국부지구발육유구조권폐화암성권폐。장2지층발육후도교대적분류간만니암균충당료장2유장필비적차당화봉개층。
Jiyuan area is one of the key oil and gas exploration area within the basin.Based on the research of source rocks,reservoir rocks,hydrocarbon migration and traps,this paper synthetically analyzed the hydrocarbon accumulation conditions of Chang 2 oil reservoir set in Jiyuan area.The result shows that hydrocarbon of Chang 2 oil reservoir set mainly comes from Chang 7 source rocks.The reservoir in the study area is mostly underwater distributary channel sand bodies,and sandstone is mainly composed of arkose,lithic arkose,with little feldspathic lithic sandstone,so it belongs to moderate porosity and low permeability reservoir.Compaction,cementation and dissolution are the main diagenesis types.The abnormal high pressure from Chang 7 oil reservoir set drives the oil generated from Chang 7 source rocks up to Chang 2 oil reservoir set.The oil in Chang 2 oil reservoir set is mainly trapped by structural-lithologic trap,with local area by structural trap and lithologic trap.The thick interdistributary mudstone developed in Chang 2 oil reservoir set plays the necessary role as the shield and cap rock of Chang 2 oil reservoir set.