【摘要】 恩施区块是中上扬子地区海相油气的重点勘探领域,弄清地层基本特征对后续的油气勘探具有积极意义。本文通过野外和室内外研究分析,采用野外剖面实测对比、样品制备、薄片鉴定和物性测试等方法,详细的对研究区石炭系、二叠系、三叠系重点地层进行岩石学和物性特征分析。研究结果表明:(1)研究层位岩性主要为泥微晶灰岩、生物灰岩、泥岩、碳质泥岩,局部见少量泥晶-粉晶白云岩,孔隙不太发育,主要为次生溶孔、溶洞,但绝大部分被方解石、白云石充填,也可见生物体腔被方解石、白云石交代;(2)泥岩致密,具备好的盖层能力;储层物性相对较差,孔隙度、渗透率较低,为超低孔-低渗致密性储层,受微裂缝影响,孔渗相关性不明显。更多还原

【Abstract】 Enshi is the key oil and gas exploration area of the upper Yangtze region of marine, to understand basic characteristics on subsequent formation of oil and gas exploration has positive signific ance. Through specific indoor and outdoor analysis, it mainly include measurement and contrast of field profiles, sample preparation, slice identification and physical analysis. The strata in this area mainly belong to carboniferous, permian and triassic. The results showed that,(1)the lithology of these reservoirs mainly includes micritic limestone, biogenic limestone, mudstone and carbonaceous mudstone, and also includes micritic or crystal powder dolomite in some regions. Pores in this area did not greatly developed, mainly containing secondary dissolution pores and dissolved caves, most of which were filled with calcites and dolomites. Some biological body cavities were also filled by calcites and dolomites.(2)The type of the reservoirs in this area is extremely low porosity and low permeable reservoir with relatively bad physical property because of low porosity and permeability.更多还原