煤层气、页岩气、致密砂岩气联合开采可行性分析-以川西坳陷须家河组为例
首发时间:2014-03-26
摘要:众所周知,我国的非常规天然气资源类型多,勘探程度相对较低,资源潜力较大,同时面临着政策缺位与技术落后等挑战。由于我国各个部门对各种非常规天然气的单独研究开采,不仅加大了排采成本,而且容易造成相邻气体资源的浪费。本文试图通过对煤系地层的分析与联合开发方式上的探讨,研究非常规气体中深部煤层气、页岩气及致密砂岩气三者的联合开采可行性,但对深部煤层气(1000m以下)的资源评价与赋存机理还需要加大研究;煤系地层是对三者进行联合开采的重要地质条件,有机质为腐殖型干酪根与腐泥-腐殖型干酪根的地层对三者含气层在空间上的叠置具有控制作用;本文以川西坳陷须家河组为例,探讨陆相与海陆交互相煤系地层、泥页岩层是实践联合开采的重点勘探开发区域,研发适合联合开采的开发方式,对深部煤层气、页岩气及致密砂岩气进行分层压裂、多层开采,可降低开发成本。
关键词: 非常规油气;煤系地层;联合开采;可行性
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The Feasibility Study on the Joint Exploitation ofDeep Coalbed Methane、Shale Gas and Tight Sandstone Gas-an example from gas exploration in the Xujiahe Formation of the western Sichuan Depression,the Sichuan Basin
Abstract:As we know, there are abundant unconventional natural gas resources(UCRs) in China.Totally, lower exploration degree of UCRs means good development potentials in China,and at same time,development of UCRs in China faces some challenges of shortage of incentive policies and lagging technologies. Due to the different departments in our country study the exploration of all kinds of UCRs by itself, it not only increased the cost of production, and easy to cause the waste of adjacent gas. Through the analysis of the coal measure strata and the investigate of the joint exploration method, this paper considered that the joint exploitation of the deep coalbed methane、shale gas and tight sandstone gas is feasiblility,but the evaluation of the deep coalbed methane (above 1000m) resource and the occurrence mechanism all are need to accelerate research.Coal measure strata is importance of the geological conditions for the joint exploitation of the deep coalbed methane、shale gas and tight sandstone gas, organic matter as humic and sapropelic kerogen-humic kerogen type are on the role of a control of the formation of gas-bearing in the space of three superimposed . According to the Xujiahe Formation in western Sichuan depression, investigated that the coal measure strata in continental facies and the clay shale in Paralic are the dominate area for the exploration and development of the joint exploitation.To reduce development costs, make more research and development for the appropriate ways of the joint exploitation, make the deep coal-bed methane, shale gas and tight sandstone gas fracture stratified、exploit co-layer.
Keywords: Unconventional oil & gas coal measure strata Joint exploitation feasibility
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No.4590589964616139****
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煤层气、页岩气、致密砂岩气联合开采可行性分析-以川西坳陷须家河组为例
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