临兴区块煤系非常规天然气共采可行性地质评价

发布时间：2018-01-20 04:14

  本文关键词： 临兴区块 煤系非常规天然气 共采 地质评价 有利区　出处：《中国矿业大学》2016年硕士论文　论文类型：学位论文

【摘要】：鄂尔多斯盆地石炭二叠纪煤系非常规天然气(煤系气)十分富集,近年来勘探试验不断取得突破,但共采潜力及其非均质性分布不明,后续开发亟待共采可行性地质评价方法的支持。为此,本文剖析了该区煤系气储层空间展布及其发育特征,研究了不同类型储层含气性识别方法,探讨了煤系气成藏的地质控制作用,建立了煤系气单采、共采地质模型和综合评价方法体系。结果表明:该区煤系烃源岩有机质以Ⅲ型为主,成熟度较高,气源充足;多个主煤储层发育范围广且厚度大,太原组砂岩储层在局部地区厚度和含气性均相对较大,成岩溶蚀孔较发育,是潜在的有利储层。根据样品测试、气测录井资料和测井解释,耦合沉积、成岩、水文、构造等地质因素,综合分析了煤系不同类型储层的空间展布特征及含气性分布规律,优选出影响煤系气单采和共采的地质因素,提炼出主煤层与砂岩储层的四种生储盖模式。采用灰色关联法,结合煤层气和煤系致密砂岩气共采产能数值模拟,以20%和80%的单类储层产气量累计贡献率作为确定共采可行性界限值。基于产能公式计算共采综合评价指数,对比共采可行性界限值,得到综合评价指数4.44、8E-7、9E-4三个关键界限值。根据关键界限值将共采可行性划分为四类,分析了各类产层组合的共采可行性,预测和评价了共采有利区的区域分布。
[Abstract]:Carboniferous Permian unconventional natural gas (CBG) is very rich in Ordos Basin. In recent years, exploration experiments have made a breakthrough, but the potential of co-production and its heterogeneity distribution are unknown. The following development is urgent to be supported by the geological evaluation method of co-production feasibility. Therefore, the spatial distribution and development characteristics of coal-measure gas reservoirs in this area are analyzed, and the identification methods of gas-bearing properties of different types of reservoirs are studied. The geological control of coal-measure gas accumulation is discussed, and the geological model and comprehensive evaluation system of coal-measure gas single recovery and co-production are established. The results show that the organic matter of coal-measure hydrocarbon source rocks in this area is mainly type 鈪，

本文编号：1446804