川东南地区志留系页岩含气量特征及其影响因素

发布时间：2019-01-07 07:03

【摘要】：页岩含气量是页岩气勘探潜力评价、勘探有利区优选、资源量计算的重要指标,也是后期进行开发规划、气藏描述、储量计算的关键参数。为了探索影响页岩含气量的因素,应用统一的方法现场测量了四川盆地东南不同地区多口页岩气探井的含气量,通过对比分析其含气量特征,找到了不同页岩气探井的岩性、总有机碳含量、孔隙度、压力系数等参数与含气量的关系,归纳了影响页岩含气量的主要因素。结论认为,影响页岩含气量的因素可以分为两大类:(1)只在早期对含气量有影响的基础因素,主要为有机质类型、有机质丰度、岩性、黏土矿物含量等;(2)控制页岩含气量的关键因素是保存条件,构造样式和断裂发育程度是影响保持条件的主要因素。孔隙度、孔隙结构、压力系数等参数不是影响页岩含气量的因素,而是表征页岩含气量高低的指标性参数,因此在勘探中可以尝试通过孔隙度预测或压力预测来判断页岩的含气性。
[Abstract]:Shale gas content is an important index for the evaluation of shale gas exploration potential, the optimal selection of exploration favorable areas and the calculation of resource quantity. It is also the key parameter for the later development planning, gas reservoir description and reserves calculation. In order to explore the factors affecting shale gas content, the gas content of many shale gas exploration wells in different areas of southeast Sichuan Basin was measured by using a unified method, and the lithology of different shale gas exploration wells was found by comparing and analyzing the gas content characteristics of different shale gas exploration wells. The relationship between total organic carbon content, porosity, pressure coefficient and gas content is discussed, and the main factors affecting shale gas content are summarized. The conclusion is that the factors affecting shale gas content can be divided into two categories: (1) the basic factors that affect the gas content only in the early stage, mainly organic matter type, organic matter abundance, lithology, clay mineral content and so on; (2) the key factor to control shale gas content is the preservation condition, and the structural style and the degree of fault development are the main factors affecting the retention condition. The parameters such as porosity, pore structure and pressure coefficient are not the factors affecting shale gas content, but the index parameters that characterize shale gas content. Therefore, the porosity prediction or pressure prediction can be used to judge the gas content of shale in exploration.
【作者单位】：中国石化勘探分公司;
【基金】：中国石油化工集团公司科技项目“四川盆地周缘下组合页岩气形成条件与有利区带评价”(编号:P13129)
【分类号】：P618.13

【相似文献】