本文選題：煤儲層 + 煤層氣�。� 參考：《煤炭科學(xué)技術(shù)》2017年01期

【摘要】：針對當(dāng)前我國低煤階煤煤層氣尚未實現(xiàn)區(qū)塊、盆地層次上商業(yè)化開采的現(xiàn)狀,為加深對以“可采性”為核心的低階煤層氣開采地質(zhì)條件的認(rèn)識,從低煤階煤煤層氣成因、煤儲層特性、煤層氣成藏模式等方面,系統(tǒng)總結(jié)了我國低煤階煤煤層氣基礎(chǔ)地質(zhì)特征研究的最新進(jìn)展,并指出了研究過程中所存在的問題及今后的發(fā)展趨勢。結(jié)果表明:低煤階煤煤層氣具有3類成因及多氣源補充的特點;煤儲層宏觀裂隙張開程度及連通性好,基質(zhì)孔隙度較大,具有吸附時間短、解吸效率高、擴散量低,擴散系數(shù)和擴散率較高,滲透率偏低的特征;氣源補給與保存條件是控制低階煤含氣量的關(guān)鍵。目前低煤階煤煤層氣勘探開發(fā)仍需解決4個方面的地質(zhì)問題:1以現(xiàn)有的工藝技術(shù)水平界定低煤階煤煤層氣形成工業(yè)氣流的含氣性參數(shù)下限;2通過儲層敏感性評價及主控地質(zhì)因素研究實現(xiàn)儲層可改造性預(yù)測;3三相態(tài)時空分布規(guī)律及各相態(tài)的地質(zhì)控制因素是探尋低煤階煤煤層氣富集規(guī)律及有利地質(zhì)條件的核心問題;4建立以“可采性”為核心的低煤階煤煤層氣可采地質(zhì)模式與地質(zhì)選區(qū)評價體系。
[Abstract]:In view of the current situation of commercial exploitation of low rank coal-bed methane in China, which has not yet been realized at the basin level, in order to deepen the understanding of the geological conditions of low-rank coal-bed methane exploitation with "recoverability" as the core, the origin of low-rank coal-bed methane is analyzed. In the aspects of coal reservoir characteristics and coalbed methane accumulation model, this paper systematically summarizes the latest progress in the study of basic geological characteristics of coal bed methane with low coal rank in China, and points out the problems existing in the research process and the development trend in the future. The results show that coal bed methane with low rank coal has three types of genesis and multiple gas sources, and the macroscopic crack opening degree and connectivity of coal reservoir are good, the matrix porosity is large, the adsorption time is short, the desorption efficiency is high, and the diffusion amount is low. The characteristics of high diffusion coefficient, high diffusivity and low permeability, and the recharge and preservation conditions of gas source are the key to control the gas content of low rank coal. At present, the exploration and development of coal bed methane with low rank coal still need to solve four aspects of geological problems: 1. Defining the lower limit of gas content parameters of industrial gas flow from coal bed methane of low rank coal with existing technical level through reservoir sensitivity evaluation The study of the main controlling geological factors and the realization of the reservoir remolding prediction of the three-phase space-time distribution law and the geological control factors of each phase are the core problems in exploring the enrichment law and favorable geological conditions of coal-bed methane of low rank coal. Low rank coal-bed methane recoverable geological model and geological selection evaluation system with "recoverability" as the core.
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本文編號：1889468