GEOLOGICAL CONDITIONS OF SHALE GAS ACCUMULATION OF PALEOGENE SHAHEJIE FORMATION IN THE WESTERN SAG OF LIAOHE BASIN
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摘要: 在辽河盆地各构造单元中以西部凹陷湖泊沉积持续时间最长，是研究辽河盆地沙河街组页岩气成藏的良好地区.本次在大量的资料收集、整理和分析的基础上，对辽河盆地西部凹陷沙河街组页岩气成藏地质条件进行初步分析，结果表明：本区的暗色泥岩主要发育在半深湖-深湖环境中，暗色泥岩具有厚度大、连续性强、分布广的特点.有机质丰度较高，TOC平均值在2.18%左右.干酪根类型以II型为主，偏向产气.有机质成熟度基本大于0.59%，表明泥页岩已基本进入大量排烃阶段.脆性矿物总量达到43.1%~61.5%，有利于页岩气开采.在页岩气成藏的地质因素分析基础上，综合研究认为，清水洼陷是沙河街组页岩气富集的有利区域.Abstract: The Western Sag of Liaohe Basin, which keeps the longest time of lake sedimentation in the basin, is an ideal area for the research of shale gas accumulation conditions of Shahejie Formation in Liaohe Basin. On the basis of data collection, processing and analysis, it is concluded that, the dark mudstone in the study area is mainly developed in half deep-deep lake environment with thick bottom, good continuity and wide distribution. The abundance of organic matter in mudstone is high, with average TOC around 2.18%. The kerogen is dominated by type II, preferring to produce gas. The maturity of organic matter is generally greater than 0.59%, suggesting that the shale has entered the major stage of hydrocarbon expulsion. The contents of brittle minerals are up to 43.1%-61.5%, which is advantageous for the exploitation of shale gas. Comprehensive analysis of the geological factors of shale gas accumulation shows that the Qingshui subsag serves as the favorable area for shale gas exploration in the Western Sag.
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