靖边气田南部奥陶系马五1+2亚段储集层成岩演化特征

doi:10.7657/XJPG20200206

摘要/Abstract

摘要：

鄂尔多斯盆地奥陶系马五₁₊₂亚段天然气储量丰富,是靖边气田奥陶系油气勘探的重点层系,其储集层成因和孔隙结构复杂,受多期成岩作用的控制。基于钻井岩心、薄片和储集层物性资料,分析总结了靖边气田南部奥陶系马五₁₊₂亚段储集层成岩作用及其孔隙演化特征。研究结果表明,靖边气田南部奥陶系马五₁₊₂亚段发育一套局限—蒸发台地的白云岩储集层,以膏溶孔和溶缝为主要储集空间,整体为低孔低渗的微裂缝-孔隙型储集层。储集层在形成过程经历了多种成岩作用,包括白云石化作用、压实压溶作用、胶结充填作用、表生岩溶作用、交代作用、构造破裂作用等。其中,同生—准同生期高盐度海水环境下发生的白云石化作用及石膏沉淀,为加里东运动表生成岩期溶蚀作用和微裂缝的发育奠定了有利条件,是储集层形成的物质基础;加里东运动表生成岩期大气淡水对石膏结核的溶蚀以及微裂缝的扩溶改造大幅提升了储集层孔渗性能,是储集层形成的关键;埋藏成岩期孔隙流体的石英和方解石胶结充填使得早期孔隙有所减少,表现为破坏性成岩作用。此外,晚成岩期的构造活动也产生了少量开启微裂缝,提高了局部孔渗性能,最终形成以膏溶孔和溶缝为主的储集空间,以微（溶）裂缝为主要渗滤通道的白云岩储集层。

关键词: 靖边气田, 奥陶系, 马家沟组, 白云岩储集层, 成岩作用, 孔隙演化

Abstract:

The Ordovician Ma5₁₊₂ sub-member in Ordos basin is known to be rich in natural gas resources, which is the key target for oil and gas exploration in Ordovician formation in Jingbian gasfield. Based on the data of core, thin section and reservoir physical property, this paper analyzes and summarizes the diagenesis as well as porosity evolution of Ordovician Ma5₁₊₂ submember reservoir in the southern Jingbian gasfield. A series of restricted-evaporative platform dolomite reservoir is developed in the Ordovician Ma5₁₊₂ sub-member of the southern Jingbian gasfield, which is a low porosity, low permeability reservoir of micro-fracture-pore type with the main reservoir space dominated by gypsum dissolved pores and dissolved fractures. The reservoir has experienced multiple stages of diagenesis including dolomitization, compaction and pressure dissolution, cementing-filling, epigenic karstification, metasomatism and tectonic fracturing. Among them, the syngenetic-penecontemporaneous dolomitization and gypsum precipitation in high salinity seawater provided favorable conditions for epigenic karstification and fracture formation during Caledonian Movement, which were the basis of reservoir formation. During the supergene period, gypsum nodules were dissolved and micro-fractures were enlarged by meteoric freshwater, thus the reservoir properties were significantly improved. During the burial diagenesis period, the cementing-filling of quartz and calcite caused the reduction of pores, displaying a destructive diagenesis. Additionally, the tectonic activities at the late diagenesis period resulted in some open micro-fractures, which improved local reservoir properties, and finally the dolomite reservoir was formed with the reservoir spaces dominated by gypsum dissolved pores and dissolved fractures, and with the micro(dissolved) fractures as the main filtration channels.

Key words: Jingbian gasfield, Ordovician, Majiagou formation, dolomite reservoir, diagenesis, pore evoluation

中图分类号:

TE112.221

李朝旭, 秦启荣, 田国庆, 孙靖虎, 崔涵, 邹开真. 靖边气田南部奥陶系马五₁₊₂亚段储集层成岩演化特征[J]. 新疆石油地质, 2020, 41(2): 172-179.

LI Zhaoxu, QIN Qirong, TIAN Guoqing, SUN Jinghu, CUI Han, ZOU Kaizhen. Diagenetic Evolution of the Ordovician Ma5₁₊₂ Sub-Member Reservoir in the Southern Jingbian Gasfield, Ordos Basin[J]. Xinjiang Petroleum Geology, 2020, 41(2): 172-179.

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靖边气田南部奥陶系马五₁₊₂亚段储集层成岩演化特征

Diagenetic Evolution of the Ordovician Ma5₁₊₂ Sub-Member Reservoir in the Southern Jingbian Gasfield, Ordos Basin

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