Features and influencing factors of Chang 7 reservoir of Yanchang Formation in Hujianshan area, Ordos Basin
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摘要: 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。Abstract: 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 sandstones 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 factors include quartz content, size of detrital grain, depositional micro-facies and diagenesis, etc.
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Key words:
- Chang 7 strata /
- Yanchang Formation /
- Triassic /
- reservoir characteristics /
- influencing factors /
- Hu jianshan area /
- Ordos Basin
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