博格达山周缘二叠系芦草沟组沉积演化及其对储层的控制

Sedimentary evolution of Permian Lucaogou Formation around Bogda Mountains and its control on reservoirs

李万安 韩长城 田继军 曾治平 闫嘉启 罗锦昌 李璐

新疆大学地质与矿业工程学院，新疆 乌鲁木齐 830047 中国石化胜利油田分公司勘探开发研究院，山东 东营 257015

College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

为研究博格达山周缘芦草沟组沉积演化及其对储层发育的影响，结合露头剖面、钻井岩心、岩石薄片、X射线衍射和地球化学等资料，对芦草沟组的沉积环境、沉积相类型及储层特征进行了分析。结果表明：芦草沟组发育扇三角洲和湖泊沉积相，沉积环境以淡水—半咸水贫氧弱还原条件为主；芦草沟组岩性以碳酸盐岩和陆源碎屑混合沉积为主，储层物性与沉积微相类型呈现较强的相关性；受沉积条件和成岩作用的共同影响，扇三角洲前缘水下分流河道砂体的储集物性更优，且临近烃源岩，溶蚀孔隙较发育，为有利储层沉积相带。该成果可为研究区油气勘探开发提供参考。

 In order to study the sedimentary evolution of Permian Lucaogou Formation around Bogda Mountains and its influence on the development of the reservoir, combined with the outcrop profile, drilling core, thin section, X-ray diffraction and geochemistry data, this paper analysed the sedimentary environment, the type of sedimentary microfacies and reservior characteristics of the Lucaogou Formation. The results show that the Lucaogou Formation develops fan delta and lacustrine sedimentary facies, and the depositional environment is dominated by freshwater-brackishwater and oxygen-poor weak reduction conditions. The lithology of Lucaogou Formation is composed mainly of carbonate rocks and terrigenous clastics mixed deposition, and there is a strong correlation between the physical properties of the reservoir and the type of sedimentary microfacies. Due to the joint influence of sedimentation and diagenesis, the submerged distributary channel sandbody in the fan delta front has favorable reservoir properties, and is close to the source rock, and the dissolved pores of that are relatively developed, which are favorable sedimentary microfacies. The results are expected to provide reference for oil and gas exploration and development in the study area.

10.6056/dkyqt202303008