本文選題：鄂爾多斯盆地東緣 + 晚古生代�。� 參考：《天然氣工業(yè)》2017年11期

【摘要】：鄂爾多斯盆地東緣煤層氣、致密砂巖氣及頁巖氣"三氣"共存,該區(qū)上古生界煤系儲層垂向上存在著多個獨立的含氣系統(tǒng),目前對該類煤系疊置含氣系統(tǒng)發(fā)育的沉積控制機理尚缺乏系統(tǒng)深入的研究。為此,基于該區(qū)臨興區(qū)塊上石炭統(tǒng)本溪組—下二疊統(tǒng)山西組鉆井巖心觀察及鉆井、測井資料分析結果,探討了上述問題。研究結果表明:(1)該區(qū)煤系疊置含氣系統(tǒng)的發(fā)育受控于層序格架內(nèi)具低孔隙度、低滲透率和高突破壓力的含菱鐵礦層(關鍵層)的空間展布;(2)關鍵層的發(fā)育受控于區(qū)域海侵事件層的空間分布,主要發(fā)育于最大海泛面附近并構成疊置含氣系統(tǒng)隔水阻氣的邊界;(3)二級層序內(nèi)最大海泛面附近廣泛發(fā)育的關鍵層,構成了全區(qū)穩(wěn)定發(fā)育的含氣系統(tǒng)邊界,三級層序最大海泛面附近發(fā)育的關鍵層常因后期(水下)分流河道沖刷切割而保存不全,促使相鄰層序的煤系儲層組合成統(tǒng)一的含氣系統(tǒng),為該區(qū)煤層氣與致密砂巖氣的共采創(chuàng)造了有利的地質條件。
[Abstract]:Coalbed methane, tight sandstone gas and shale gas coexist in the eastern margin of Ordos Basin. There are several independent gas-bearing systems in the upper Paleozoic coal series reservoir vertical direction. At present, the depositional control mechanism of the superimposed gas bearing system of this kind of coal measures is still lack of systematic and deep research. Therefore, based on the core observation and drilling data analysis of the upper Carboniferous Benxi formation and lower Permian Shanxi formation in Linxing block, the above problems are discussed. The results show that the development of superimposed gas-bearing system of coal measures in this area is controlled by the low porosity in the sequence framework. The development of the key layers with low permeability and high breakthrough pressure is controlled by the spatial distribution of regional transgressive event layers. The key layers, which are mainly developed near the largest sea flooding surface and constitute the boundary of the superimposed gas-bearing system to prevent water and gas, are widely developed near the largest sea panoramic surface in the second order sequence, and constitute the boundary of the gas-bearing system which develops stably in the whole area. The key layers developed near the largest sea flooding surface of the third order sequence are often not preserved completely due to the scour and cutting of the distributary channel in the late stage (underwater), which urges the coalbed reservoirs of the adjacent sequences to be combined into a unified gas-bearing system. It creates favorable geological conditions for coproduction of coalbed methane and tight sandstone gas in this area.
【作者單位】： 煤層氣資源與成藏過程教育部重點實驗室;中國礦業(yè)大學資源與地球科學學院;中聯(lián)煤層氣有限責任公司;
【基金】：國家科技重大專項(編號:2016ZX05044-002-001、2016ZX05066-001-004) 國家自然科學基金項目(編號:41672146、41541046)
【分類號】：P618.13

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