澳大利亚苏拉特盆地Walloon煤组成藏条件及富集模式

发布时间：2018-12-29 10:45

【摘要】：中侏罗统Walloon亚群煤组是澳大利亚苏拉特(Surat)盆地煤层气藏的主要储层,为一套典型的低煤阶高产煤层。为了明晰该煤组的煤层气成藏条件及富集模式,基于录井、实验和测试资料,研究了该煤组的展布特征及烃源岩条件、储集条件与保存条件,结合对该煤组的天然气成因及含气性特征分析结果,对比分析了该盆地东北部3个煤层气开发区在气藏富集模式上的差异,并归纳了Walloon煤组成藏及富集的有利条件。结论认为:(1)构造运动、地下水条件以及显微组分为Walloon煤组的生气创造了有利条件,该煤组的顶、底板及夹层岩性致密,封闭条件较好;(2)Walloon煤层气藏是一个形成在单斜构造上由水动力和岩性共同封闭的以次生生物成因气为主的混合成因气藏,煤层气的富集受局部构造、煤层生气能力和地下水动力3种因素的控制,并可分为背斜、向斜和斜坡3种模式,其中背斜模式、向斜模式的煤层气富集程度相对更高;(3)与其他煤层气藏相比,Walloon煤层气藏的成藏和富集同时具有双重碳源、高效生气、适中水动力和双重封闭4个有利条件。
[Abstract]:The Walloon subgroup coal formation of the Middle Jurassic is the main reservoir of coalbed methane reservoir in (Surat) basin of Surat, Australia, which is a typical coal seam with low coal rank and high yield. In order to understand the coalbed methane accumulation conditions and enrichment model of the coal formation, based on the logging, experimental and test data, the distribution characteristics, hydrocarbon source rock conditions, reservoir conditions and preservation conditions of the coal formation are studied. Based on the analysis of the natural gas genesis and gas-bearing characteristics of the coal formation, the differences of the gas accumulation patterns in the three coalbed methane development zones in the northeastern part of the basin are compared and analyzed, and the favorable conditions for the Walloon coal composition and accumulation are summarized. The conclusions are as follows: (1) the tectonic movement, groundwater condition and microscopic composition of Walloon coal group have created favorable conditions for gas generation. The top, bottom plate and intercalation of the coal group are compact, and the sealing conditions are better; (2) Walloon coalbed methane reservoir is a hybrid gas reservoir formed in monoclinic structure, which is mainly composed of secondary biogenic gas and hydrodynamic and lithologic sealing. The coal bed gas generating ability and groundwater dynamics are controlled and can be divided into three models: anticline syncline and slope in which the anticline model and syncline model are relatively higher in coalbed methane enrichment. (3) compared with other coalbed methane reservoirs, the accumulation and accumulation of Walloon coalbed methane reservoirs have four favorable conditions: dual carbon source, high efficiency gas generation, moderate hydrodynamic force and double sealing.
【作者单位】：中海石油气电集团有限责任公司技术研发中心;中国地质大学(北京)能源学院;
【基金】：国家自然科学基金项目(编号:41272167) 中海石油气电集团科研课题(编号:QDKY-2017-YFZX-12)
【分类号】：P618.13

【相似文献】