古交区块石炭二叠系含煤层气系统
发布时间：2018-07-13 13:38
【摘要】：古交区块垂向上发育多套含气系统,流体压力系统差异以及合采兼容性差异是制约煤层气合层开采的重要因素。以古交区块煤层气勘探开发资料为依据,研究了流体压力系统以及含气性空间展布特征。以典型钻孔煤及岩石物性实验为基础,分析了含煤地层垂向上物性旋回特征及其沉积控制机理,认为古交区块大部分储层处于欠压状态,受到断裂影响,山西组与太原组储层压力梯度差在北部构造断裂发育区较小。发现最大海泛面附近岩石渗透率较低,为隔水阻气层的关键层;含煤层气系统垂向分布与层序地层单元具有较好的对应关系。根据层序地层以及含煤层气单元发育特征,认为上、下煤层间泥岩累积厚度2m可作为划分不同含气系统的界限,据此,讨论了古交区块含煤层气系统关键层形成过程及其空间展布格架。研究了区内开放性断层发育规律,确定了含煤层气系统叠置关系。分析前期煤层气井单层与合层开采效果,结合煤层气井气、水产出历史,分析了影响产气效果的主控地质因素。通过煤层气产能数值模拟,分析了研究区多煤层合采兼容性,建立了地质兼容性评价方法,据此划分了煤层气开发地质单元。
[Abstract]:There are many sets of gas-bearing systems developed vertically in Gujiao block. The difference of fluid pressure system and the compatibility of combined production are the important factors that restrict the exploitation of coalbed methane combined layer. Based on the exploration and development data of coalbed methane in Gujiao block, the characteristics of fluid pressure system and gas-bearing spatial distribution are studied. Based on the experiments of typical drilled coal and rock physical properties, this paper analyzes the vertical physical cycle characteristics of coal-bearing strata and its sedimentary control mechanism. It is considered that most of the reservoirs in Gujiao block are in underpressure state and affected by faults. The difference of reservoir pressure gradient between Shanxi formation and Taiyuan formation is small in the northern tectonic fault development area. It is found that the permeability of rock near the maximum sea flooding surface is low, which is the key layer of water and gas barrier, and the vertical distribution of coal-bed gas system has a good corresponding relationship with the sequence stratigraphic unit. According to the development characteristics of sequence stratigraphy and coalbed methane unit, it is considered that the cumulative thickness of mudstone between upper and lower coal seams can be regarded as the boundary of dividing different gas-bearing systems. This paper discusses the formation process of key layers of coal-bed methane system in Gujiao block and its spatial layout. The development law of open fault in this area is studied and the superposition relation of coalbed methane system is determined. This paper analyzes the production effect of single layer and combined layer of coalbed gas wells in the early stage, and analyzes the main controlling geological factors affecting the gas production effect in combination with the production history of coal bed gas wells and aquatic products. Through the numerical simulation of coalbed methane productivity, the compatibility of multiple coal seams in the study area is analyzed, and the evaluation method of geological compatibility is established, according to which the geological units of coalbed methane development are divided.
【学位授予单位】：中国矿业大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P618.13
，
本文编号：2119556
[Abstract]:There are many sets of gas-bearing systems developed vertically in Gujiao block. The difference of fluid pressure system and the compatibility of combined production are the important factors that restrict the exploitation of coalbed methane combined layer. Based on the exploration and development data of coalbed methane in Gujiao block, the characteristics of fluid pressure system and gas-bearing spatial distribution are studied. Based on the experiments of typical drilled coal and rock physical properties, this paper analyzes the vertical physical cycle characteristics of coal-bearing strata and its sedimentary control mechanism. It is considered that most of the reservoirs in Gujiao block are in underpressure state and affected by faults. The difference of reservoir pressure gradient between Shanxi formation and Taiyuan formation is small in the northern tectonic fault development area. It is found that the permeability of rock near the maximum sea flooding surface is low, which is the key layer of water and gas barrier, and the vertical distribution of coal-bed gas system has a good corresponding relationship with the sequence stratigraphic unit. According to the development characteristics of sequence stratigraphy and coalbed methane unit, it is considered that the cumulative thickness of mudstone between upper and lower coal seams can be regarded as the boundary of dividing different gas-bearing systems. This paper discusses the formation process of key layers of coal-bed methane system in Gujiao block and its spatial layout. The development law of open fault in this area is studied and the superposition relation of coalbed methane system is determined. This paper analyzes the production effect of single layer and combined layer of coalbed gas wells in the early stage, and analyzes the main controlling geological factors affecting the gas production effect in combination with the production history of coal bed gas wells and aquatic products. Through the numerical simulation of coalbed methane productivity, the compatibility of multiple coal seams in the study area is analyzed, and the evaluation method of geological compatibility is established, according to which the geological units of coalbed methane development are divided.
【学位授予单位】：中国矿业大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P618.13
，
本文编号：2119556
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