【摘要】：古交區(qū)塊垂向上發(fā)育多套含氣系統(tǒng),流體壓力系統(tǒng)差異以及合采兼容性差異是制約煤層氣合層開采的重要因素。以古交區(qū)塊煤層氣勘探開發(fā)資料為依據(jù),研究了流體壓力系統(tǒng)以及含氣性空間展布特征。以典型鉆孔煤及巖石物性實驗為基礎(chǔ),分析了含煤地層垂向上物性旋回特征及其沉積控制機理,認為古交區(qū)塊大部分儲層處于欠壓狀態(tài),受到斷裂影響,山西組與太原組儲層壓力梯度差在北部構(gòu)造斷裂發(fā)育區(qū)較小。發(fā)現(xiàn)最大海泛面附近巖石滲透率較低,為隔水阻氣層的關(guān)鍵層;含煤層氣系統(tǒng)垂向分布與層序地層單元具有較好的對應關(guān)系。根據(jù)層序地層以及含煤層氣單元發(fā)育特征,認為上、下煤層間泥巖累積厚度2m可作為劃分不同含氣系統(tǒng)的界限,據(jù)此,討論了古交區(qū)塊含煤層氣系統(tǒng)關(guān)鍵層形成過程及其空間展布格架。研究了區(qū)內(nèi)開放性斷層發(fā)育規(guī)律,確定了含煤層氣系統(tǒng)疊置關(guān)系。分析前期煤層氣井單層與合層開采效果,結(jié)合煤層氣井氣、水產(chǎn)出歷史,分析了影響產(chǎn)氣效果的主控地質(zhì)因素。通過煤層氣產(chǎn)能數(shù)值模擬,分析了研究區(qū)多煤層合采兼容性,建立了地質(zhì)兼容性評價方法,據(jù)此劃分了煤層氣開發(fā)地質(zhì)單元。
[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.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：P618.13
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本文編號：2119556