苏里格东部地区奥陶系马家沟组马五5亚段成岩作用及其对储层的影响研究

Study of diagenesis of the fifth submember of the Majiagou formation of Ordovician and its influence on reservoir in eastern Sulige

通过对苏里格东部地区奥陶系马家沟组马五5亚段的成岩作用及空隙度演化进行综合分析,根据镜下资料,对马五5亚段的成岩作用及其对储层的影响进行了推断与总结,得出马五5亚段储层在不同的成岩阶段,成岩作用对有效储层的影响不同,研究区有效储层以白云岩为主,主要为蒸发潮坪相沉积区,后期由回流渗透白云化作用所形成的晶间孔对研究层位中储集空间的形成有积极影响及重要意义。对后期马五5亚段的油气勘探具有一定的参考意义。

Based on the comprehensive analysis of diagenesis and voidage evolution of M55 sub-member of Ordovician Majiagou Formation in eastern Sulige area,combined with microscopic data,the diagenesis of M55 sub-member and its influence on reservoir are inferred and summarized.It is found that the diagenesis of Majiagou formation in different diagenesis stages affects the reservoir.The effective reservoirs in the study area are mainly dolomite,mainly evaporative tidal flat facies sedimentary area.The intergranular pore formed by reflux permeation dolomitization in the later stage has a positive impact on the formation of reservoir space in the study horizon.It has a certain reference significance for oil and gas exploration in the later M55 sub-member.