页岩气深度富集带理论研究及应用

The Study on the Application and Enrichment Patterns of Shale Gas in Synclinal

页岩气是一种自生自储的非常规天然气资源。研究表明:页岩含气量分布特征主要受页岩储层埋深、储层构造形态、有机碳含量以及储层物性等因素的影响。页岩气是吸附气、游离气和溶解气三种赋存状态的动态平衡。通过页岩气的勘探与开发实践,我们获得重要的理论认识:页岩含气量与地层埋深是一种抛物线关系模型,即页岩深度富集带L-W模型。页岩气勘探开发实践表明,向斜为页岩气富集的主要构造控制因素。因此,在我国总体构造运动比较强烈的地质背景条件下,寻找构造运动比较弱的部位,比如地层产状比较平缓的向斜地区,确定有利勘探方向的页岩气目标区域。

Shale gas is one of unconventional natural gas reservoirs, with forming pattern of self--generating and self--preserving. The research indicates that the distribution characteristics of shale gas content is influenced by the factors of the depth, the structure shape, the total carbon organic and the physical property of shale reservoir. The shale gas is on dynamic balance among the adsorbed gas, the free gas and the dissolved gas. By the exploration and development of shale gas,we obtained important theoretical understanding that there exists a parabola model relation between the shale gas content and the depth of shale reservoir, which is called L--W model of enriched accumulation belts of shale depth. Theory and practice studies show that the synclinal layer is the main structural factors controlling the enrichment of shale gas. Therefore, in the background of stronger geological tectonic movements in our country, finding weak tectonic area such as the synclinal layer formation occurrence, is the exploration direction for determination of favorable target areas of shale gas.