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鄂尔多斯盆地奥陶系马家沟组为重要的含气层系,该文深入研究了靖边潜台南部地区马家沟组碳酸盐岩的成岩作用类型及其成岩条件,其中对储集条件最具影响的为白云石化作用、古岩溶作用和胶结交代作用;根据各成岩作用的特征及其共生序列关系,认为这套碳酸盐岩主要经历了准同生成岩、表生成岩、早成岩和中成岩4个成岩阶段,目前已达中成岩阶段的晚期;在成岩作用及其序列组合研究的基础上,开展了成岩相组合研究,粗略划分出3个成岩相,即表生古岩溶-早期充填胶结成岩相、表生古岩溶-埋藏古岩溶成岩相和埋藏胶结成岩相,其中表生古岩溶-埋藏古岩溶相具有最好的储集性。根据影响各成岩相分布因素的初步研究,确定了重点研究层段成岩相的平面展布,为该区的储层评价及预测提供了依据。
The Ordovician Majiagou Formation in the Ordos Basin is an important gas-bearing formation. In this paper, the diagenetic types and diagenesis conditions of the carbonate rocks in the Majiagou Formation in the southern Jingbian submarine are studied in detail. For the reservoir conditions The most influential ones are dolomitization, palaeokarst and cementation. Based on the characteristics of diagenesis and their symbiosis sequence, the carbonate rocks are mainly characterized by quasi-conglomerate, epigenesis, And diagenetic stage of four diagenetic stages, has reached the late stage of the diagenetic stage; on the basis of diagenesis and sequence combination studies, carried out research on diagenetic phase assemblage, roughly divided into three diagenetic facies, namely epiphytic karstification - In the early stage, the cements were filled with cementary facies, epikarst ancient karst-burial karst facies and burial cemented facies. The epikarst paleokarst-burial karst facies had the best reservoir property. According to the preliminary study of the factors that influence the distribution of diagenetic facies, the plane distribution of diagenetic facies in key research intervals is confirmed, which provides the basis for reservoir evaluation and prediction in this area.