CAJ | 학술논문

以往主要将长7作为鄂尔多斯盆地的生烃层系进行研究.近年来在胡尖山地区长7油层组发现了大量工业油流井,但油藏分布极不均匀,油井产能有高有低.利用岩石薄片、铸体薄片、压汞和物性等资料,对胡尖山地区长7储层特征进行了深入研究,并从多角度分析了影响长7储层物性的因素.研究表明:研究区长7储层以长石砂岩和岩屑质长石砂岩为主;填隙物以铁方解石和水云母为主;储集空间以残余粒间孔和溶蚀孔为主;为微喉道;物性差,为低孔—超低渗储层.影响储层物性的因素主要有:石英含量、碎屑粒度、沉积微相和成岩作用(压实、胶结和溶蚀)等.
이왕주요장장7작위악이다사분지적생경층계진행연구.근년래재호첨산지구장7유층조발현료대량공업유류정,단유장분포겁불균균,유정산능유고유저.이용암석박편、주체박편、압홍화물성등자료,대호첨산지구장7저층특정진행료심입연구,병종다각도분석료영향장7저층물성적인소.연구표명:연구구장7저층이장석사암화암설질장석사암위주;전극물이철방해석화수운모위주;저집공간이잔여립간공화용식공위주;위미후도;물성차,위저공—초저삼저층.영향저층물성적인소주요유:석영함량、쇄설립도、침적미상화성암작용(압실、효결화용식)등.
The Chang 7 strata in the Ordos Basin were regarded as source rocks in the past. Plenty of industrial oil wells have been found in the Chang 7 strata of the Yanchang Formation in Hujianshan area of the Ordos Basin in recent years; however, the reservoirs are unevenly distributed and have different industrial productivities. Based on rock thin section, cast thin section, mercury penetration and physical property analyses, the features of the Chang 7 reservoir were studied, and the influencing factors were discussed. Arkose and lithic arkose sand-stones are most common in the Chang7 strata. The main interstitial materials are ferroan calcite and hydromica. Residual intergranular pore and dissolved pore are the dominant reservoir spaces. The Chang 7 reservoir is a low porosity and ultra-low permeability reservoir with micro-throat and poor physical property. The main affecting fac-tors include quartz content, size of detrital grain, depositional micro-facies and diagenesis, etc.