张家垛油田阜三段储层成岩作用

Diagenesis of Fu 3 Member reservoir in Zhangjiaduo Oilfield

黄方方 丁晓琪 万友利 张世懋 赵小强

成都理工大学油气藏地质及开发工程国家重点实验室，四川 成都 610059 西南石油大学资源与环境学院，四川 成都 610500

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China College of Resources and Environment, Southwest Petroleum University, Chengdu 610500, China

张家垛油田阜三段具有良好的油气勘探潜力，埋深约3 000 m，储层虽然以细砂岩和粉砂岩为主，却具有较好的储集空间，但物性差别较大，已有的勘探开发成果表明油气富集程度与储层储集物性密切相关。文中利用铸体薄片、X衍射、扫描电镜等手段对张家垛油田阜三段储层成岩作用进行研究。结果表明：阜三段在成岩早期由于欠压实的存在，原生粒间孔得以很好保存，颗粒接触类型以点?鄄线接触为主，特别是粒度偏粗、杂基含量低的砂岩；欠压实形成之前，大量的斜长石发生溶蚀形成粒间溶孔、铸模孔，异常高压形成之后，成岩体系处于封闭状态，体系内的水岩反应受到抑制，大量次生孔隙得以保存；压力系数大的地区储集物性明显比压力系数小的地区好。因此，异常高压一方面抑制了压实作用的进行，另一方面降低了成岩作用的强度，与沉积微相共同控制着储层的储集物性。

Fu 3 Member reservoir in Zhangjiaduo Oilfield has favorable petroleum exploration potential. Although mostly with fine sandstones and pink sandstones, the reservoir has good reservoir space in the depth of 3,000 m. However, the difference of physical property is great. Existing exploration and development results indicate that the accumulation degree of oil and gas is bound up with physical property. In this paper, casting slice, XRD and SEM are used to study the diagenesis of Fu 3 Member in Zhangjiaduo Oilfield. Results show that as a result of disequilibrium compaction in early diagenesis, primary pores are preserved very well and framework grains show as point to line contact; Intergranular dissolution pores, molds holes are formed as Plagioclase dissolution before the disequilibrium compaction and water-rock reaction can be restricted within the system because of closed diagenetic system after the formation of disequilibrium compaction; The area with high pressure coefficient has better reservoir physical property than the area with low pressure coefficient, therefore, overpressure can restrict the rate of compaction. On the other hand, it can reduce the intension of diagenesis and control the reservoir physical property together with microfacies.

10.6056/dkyqt201302004