本文選題：濟(jì)陽(yáng)坳陷 + C-P煤系��； 參考：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文

【摘要】：本文以濟(jì)陽(yáng)坳陷為研究區(qū),以石炭二疊系煤系原生氣藏為研究對(duì)象,探討了煤系煤層氣氣藏、煤型氣氣藏和煤層氣-煤型氣疊合型氣藏等典型共伴生原生氣藏的形成機(jī)理。本文利用沉積學(xué)和成藏動(dòng)力學(xué)的方法,系統(tǒng)探討了煤系原生氣藏的沉積地質(zhì)背景、成藏要素特征、成藏過(guò)程以及煤型氣氣藏和疊合型氣藏的成藏模式,并對(duì)有利區(qū)沾化凹陷孤北地區(qū)進(jìn)行了詳細(xì)剖析和潛力預(yù)測(cè),主要研究成果如下:太原組潮坪相和山西組分流間灣微相是本區(qū)烴源巖發(fā)育的主要沉積環(huán)境類型。烴源巖以鏡質(zhì)組為主,母質(zhì)類型基本上為以生氣為主的Ⅲ型干酪根,石炭系煤的生烴潛力優(yōu)于石炭系泥巖、二疊系煤和泥巖,沾化凹陷烴源巖總體質(zhì)量較其他三個(gè)凹陷要好。上、下石盒子組曲流河河道亞相發(fā)育,形成了煤型氣氣藏的主要儲(chǔ)層;砂巖孔隙以次生孔隙為主,Ⅰ類儲(chǔ)層主要出現(xiàn)在沾車地區(qū),惠民和東營(yíng)凹陷以Ⅱ和Ⅲ類儲(chǔ)層為主。山西組分流河道微相砂巖是形成疊合型氣藏的砂巖儲(chǔ)層,成條帶狀分布,從沾化和車鎮(zhèn)凹陷延伸到惠民和東營(yíng)凹陷,儲(chǔ)層物性較上、下石盒子組要差,以Ⅲ和Ⅳ類儲(chǔ)層為主。煤儲(chǔ)層的飽和吸附量隨著深度的增大呈現(xiàn)先增大后減小的變化,臨界深度出現(xiàn)在800~1500m范圍內(nèi)。濟(jì)陽(yáng)坳陷上古生界主要受印支、燕山、喜山三期構(gòu)造運(yùn)動(dòng)影響,北西向斷裂是影響煤系地層分布及煤型氣運(yùn)聚成藏的主要因素。印支期,上古生界經(jīng)歷了第一次埋深階段,最大埋深能達(dá)到3000m,但由于印支運(yùn)動(dòng)的強(qiáng)烈抬升,有機(jī)質(zhì)剛進(jìn)入生烴門限即告終止,生烴作用微弱。燕山期,煤系烴源巖埋深顯著分異,但普遍小于2500m,由于地幔熱流機(jī)制的調(diào)整,局部地區(qū)仍發(fā)生二次生排烴過(guò)程,由于燕山期末強(qiáng)烈的地殼抬升剝蝕,煤層生成的烴類不容易保存。喜山期,分為喜山早期和晚期,但烴源巖演化主要發(fā)生在喜山早期,烴源巖埋深普遍大于3000m,發(fā)生顯著的二次生排烴過(guò)程,是最主要的生排烴階段。從成藏過(guò)程分析,濟(jì)陽(yáng)坳陷煤系原生氣藏總體屬于間斷式多次成藏模式。從成藏主控因素分析,煤型氣藏成藏模式屬于斷裂控藏的“由遠(yuǎn)及近”模式;疊合型氣藏成藏模式屬于沉積控藏的自生自儲(chǔ)模式。孤北地區(qū)具有優(yōu)越的煤系原生氣藏成藏條件,義155井氣藏在下石盒子組中發(fā)現(xiàn)煤型氣,屬于斷裂控制的向斜成藏;孤北古1井氣藏在上石盒子組奎山段發(fā)現(xiàn)煤型氣,屬于斷裂控制的潛山斷鼻構(gòu)造氣藏,下石盒子組和山西組也有油氣顯示,有形成煤型氣氣藏和疊合型氣藏的前景。
[Abstract]:Taking Jiyang depression as the study area and taking the primary gas reservoir of Carboniferous Permian system as the research object, this paper discusses the formation mechanism of the typical coexisting primary gas reservoir, such as the coal measure gas reservoir, the coal-type gas reservoir and the coalbed gas-coalbed gas superposition gas reservoir. By means of sedimentology and reservoir dynamics, this paper systematically discusses the sedimentary geological background, the characteristics of reservoir forming elements, the process of reservoir formation, and the reservoir forming model of coal type gas reservoir and superimposed gas reservoir in coal measure primary gas reservoir. The main results are as follows: the tidal flat facies of Taiyuan formation and the interdistributary bay microfacies of Shanxi formation are the main sedimentary environment types of hydrocarbon source rock development in this area. The source rocks are mainly vitrinite, the parent material type is basically type 鈪，

本文編號(hào)：1906374