低渗透砂岩储层成因机理研究——以B油田为例

The study of low permeable genesis of sand stone reservoir:A case history of the B oilfield

综合利用岩心、测井及各种分析化验资料,运用储层沉积学、岩石学、构造地质学及成岩作用等相关理论,从储层低渗透宏观及微观成因方面详细总结了B油田致密砂岩储层的低渗成因。研究结果表明,沉积相带是决定储层物性好坏的先决条件;压实作用是储层物性好坏的主导因素;胶结作用是储层好坏的关键因素,使孔隙度、渗透率进一步变差;溶蚀作用使次生孔隙发育,在一定程度上改善了储层物性。综合研究认为,低渗透储层物性的影响因素主要为沉积作用和成岩作用,为讨论该地区储层致密原因提供了可靠依据。

Combined with the core, logging and different test data, the low permeable genesis of tight sand stone reservoir of B oilfield are studied by the sedimentology, lithology, structural geology and diagenesis with respects of macroscopic and microcosmic genesis of the low permeability of reservoir. The results show that the sedimentary facies belt is the prerequisite condition to control the physical property of the reservoir, the compaction is the dominant factor of that, and the cementation is the key element of the reservoir physical property. The physical properties of the reservoir are improved by the induced porosity which was developed by the denudation. The final conclusion is that the dominant factors which affect the physical properties of the low permeable reservoir are deposition and diagenesis, it present a dependable criteria for discussing the genesis of tight sand stone reservoir of B oilfield.