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。
Shale gas content is one of important indicators not only for exploration potential evaluation, favorable zones optimization, resource quantity prediction, etc. in the former preparation period but for development planning, gas reservoir description, reserves cal- culation in the latter period. This paper aims to explore the factors influencing the gas content of the Silurian shale in the SE Sichuan Basin. The uniform method was first applied to measure the gas contents of multiple shale gas exploratory wells located at different areas in this study area. Also, a comparison analysis was made of the gas content characters to disclose the relations between shale gas content and such parameters as lithologic property, TOC content, porosity, pressure coefficient, etc. In conclusion, the influencing factors of shale gas content are classified into two main types. One type is fundamental factors in the earlier gas generation period that mainly include or- ganic matter types, abundance, petrographic characters, clay material contents, etc. The other one, also as the key factor, is the preserva- tion conditions, which is mainly affected by structural style and degree of fault development. Those factors like porosity, pore structure, pressure coefficient, etc. are not real factors affecting the shale gas content but indicators for the characterization of high or low shale gas content, for which prediction on shale porosity or shale formation pressure should be tried, as suggested in shale gas exploration, to help estimate the gas content of shale.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2016年第8期36-42,共7页
Natural Gas Industry
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)
关键词
四川盆地东南部
志留纪
页岩含气量
影响因素
岩性
TOC
孔隙度
压力系数
Sichuan Basin
Southeast
Silurian
Shale gas content
Controlling factors
Lithologic character
TOC
Porosity
Pressure co-efficient
作者简介
张汉荣，女，1968年生，高级工程师，博士 从事页岩气勘探研究工作。地址：（610041）四川省成都市高新区吉泰路688号。电话：13981959806。ORCID：0000-0002-4019-4909。E-mail：zhanghr．ktnf@sinopec．com
