塔巴庙上古生界碎屑岩储层非均质性及控制因素

储层非均质性是沉积、成岩和构造因素共同作用的结果.通过对鄂尔多斯盆地塔巴庙上古生界碎屑岩储层层内非均质性及微观非均质性的研究,认为储层的层内非均质性主要受控于沉积作用,沉积构造和沉积韵律决定了储层层内非均质性,而储层的微观非均质性主要受控于成岩作用,压实作用和溶蚀作用的不均衡性是影响储层微观非均质性的主要因素.通过对储层非均质性及控制因素的分析,为研究储层内天然气的分布规律提供了地质基础,并有利于指导后期的天然气勘探和开发工作.

Heterogeneity and controlling factors of the Upper Paleozoic fragmental reservoir in Tabamiao, Ordos Basin, China

The heterogeneity of reservoirs is generally controlled by sedimentation, diagenesis and tectogenesis. Due to the study of intra-layer heterogeneity and micro-heterogeneity of the Upper Paleozoic clastic reservoir in Tabamiao area, the conclusion has been achieved that the intra-layer heterogeneity of sandstone reservoirs is mainly controlled by sedimentation and that the sedimentary structure and the sedimentary rhythm determine the characteristics of intra-layer heterogeneity of reservoirs. Another conclusion is that the micro heterogeneity of reservoirs is mainly controlled by diagenesis and that the maldistribution of compaction and chemical erosion is the critical factor to influence the micro-heterogeneity of the reservoirs. As a result, the analysis of reservoir heterogeneity can offer a geological guidance for the study of gas distribution in reservoirs and also is in favor of the succedent exploration and development.