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沉积学报  2015 

鄂尔多斯盆地镇北地区延长组长4+5致密油层成岩作用及成岩相

DOI: 10.14027/j.cnki.cjxb.2015.05.016, PP. 1000-1012

Keywords: 相对高孔高渗储层,成岩作用,成岩相,鄂尔多斯盆地

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Abstract:

鄂尔多斯盆地镇北地区含凝灰质的延长组长4+5致密油层勘探潜力巨大,但因成岩作用研究薄弱,相对高孔高渗储层成因机理和分布规律认识不清,使该区勘探开发进程受到明显的制约。综合应用铸体薄片、扫描电镜、电子探针、阴极发光、显微荧光、X射线衍射、流体包裹体、高压压汞和常规物性等方法,对镇北地区的长4+5储层成岩作用及成岩相带进行了研究。研究结果表明研究区长4+5储层主要处于中成岩阶段A期,石英自生加大等硅质胶结作用和铁白云石等碳酸盐胶结作用是造成储层低孔特低渗的根本原因;绿泥石膜胶结作用和早期油的充注抑制了机械压实作用和胶结作用,保护了储层孔隙;长石碎屑的溶蚀作用扩大了储集空间。划分出机械压实相、碳酸盐胶结相、绿泥石膜胶结相和长石溶蚀相四类主要成岩相,其中长石溶蚀相常形成相对高孔高渗储层发育区,一般面孔率大于6.0%,孔隙度大于14.0%,渗透率大于1.30×10-3μm2,主要分布在辫状河三角洲前缘亚相水下分流河道微相砂体中部。综合研究表明,沉积作用和成岩作用共同控制着相对高孔高渗储层的分布。

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