本文選題：下馬嶺組頁(yè)巖 + 孔隙結(jié)構(gòu)特征��； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：燕山地區(qū)中上元古界下馬嶺組發(fā)育一套富有機(jī)質(zhì)泥頁(yè)巖,具備較好的頁(yè)巖氣成藏地質(zhì)條件。本文基于野外地質(zhì)調(diào)查和區(qū)域地質(zhì)資料研究,結(jié)合熱模擬、低溫液氮以及壓汞等測(cè)試技術(shù),對(duì)燕山地區(qū)下馬嶺組低成熟頁(yè)巖儲(chǔ)層-源巖特征、孔隙結(jié)構(gòu)特征、孔隙發(fā)育影響因素等多方面內(nèi)容進(jìn)行了深入的探究。冀北地區(qū)下馬嶺組泥頁(yè)巖體現(xiàn)為淺海陸棚沉積相,儲(chǔ)層脆性礦物含量高,有機(jī)質(zhì)含量可達(dá)到4%以上;干酪根類(lèi)型主要以I型為主,部分為Ⅱ1型;類(lèi)鏡質(zhì)體反射率為0.7%-2.03%,總體具有較好的生烴潛力。下馬嶺組頁(yè)巖主要發(fā)育溶蝕孔、粒間孔、層間孔以及微裂隙等孔縫組合。其孔隙結(jié)構(gòu)復(fù)雜,發(fā)育水瓶孔、板狀孔、開(kāi)放孔和墨水瓶孔等多種形態(tài)孔;微孔和過(guò)渡孔對(duì)孔體積和比表面積貢獻(xiàn)最大,孔隙連通性處于中等或較好水平,孔隙分形擬合度高且分形維數(shù)低,有利于吸附氣和游離氣的儲(chǔ)集、吸附、解吸、滲流;孔徑大于100nm的孔隙結(jié)構(gòu)更為復(fù)雜,孔隙表面不甚均勻,不利于氣體的滲流。頁(yè)巖孔隙的發(fā)育受沉積、構(gòu)造、礦物成分、成巖作用、熱演化等多方面因素的影響。淺水陸棚相沉積為下馬嶺組頁(yè)巖提供了大量有機(jī)質(zhì),為有機(jī)質(zhì)孔的發(fā)育提供了充足的物質(zhì)基礎(chǔ);礦物成分對(duì)頁(yè)巖無(wú)機(jī)質(zhì)孔的影響明顯,其中脆性礦物影響作用較黏土礦物更明顯;成巖作用主要影響礦物粒間孔和裂縫;熱模擬實(shí)驗(yàn)表明,孔隙總量在有機(jī)質(zhì)熱演化過(guò)程中呈線性增長(zhǎng),尤其是微孔含量可增長(zhǎng)為原始狀態(tài)下的9.04倍。不同尺度范圍的孔徑受熱演化作用影響程度具有差異性。其中微孔和中孔隨熱演化進(jìn)程不斷增加,而過(guò)渡孔和大孔含量呈先逐漸增加后又急劇下降的趨勢(shì)。且中低成熟度樣品多表現(xiàn)為開(kāi)放型的板狀孔形態(tài),各個(gè)孔徑段的孔隙均較發(fā)育;成熟樣品孔隙反映出無(wú)定形孔隙與定性孔隙結(jié)合的形態(tài),孔隙連通性相較于低成熟度樣品有一定提升;高過(guò)成熟階段樣品主要發(fā)育水瓶孔等無(wú)定形孔隙,微孔較為發(fā)育。因此,隨著有機(jī)質(zhì)演化程度不斷升高,孔隙孔徑分布逐漸集中,孔隙連通性逐漸增強(qiáng),論文據(jù)此將熱模擬中的孔隙結(jié)構(gòu)演化劃分為6個(gè)階段�？紫督Y(jié)構(gòu)的演化直接決定了頁(yè)巖氣賦存空間,其中吸附氣隨孔隙孔徑增大而呈先增大后逐漸平穩(wěn)的趨勢(shì),游離氣則呈隨孔徑增大而升高的趨勢(shì),總體上,吸附氣和游離氣在不同孔徑階段呈現(xiàn)不同的增加速率;熱演化程度對(duì)不同尺度孔徑吸附氣影響效果不同,就影響敏感性而言,大孔最為敏感,介孔次之,微孔最弱;微孔和介孔對(duì)比表面積的貢獻(xiàn)最為明顯,對(duì)頁(yè)巖氣的吸附也最有利。
[Abstract]:A set of organic shale is developed in the Lower Maling formation of the Middle and Upper Proterozoic in Yanshan area, which has good geological conditions for shale gas accumulation. Based on field geological survey and regional geological data, combined with thermal simulation, low temperature liquid nitrogen and mercury injection testing techniques, the characteristics of low mature shale reservoir and source rock and pore structure of Lower Maling formation in Yanshan area are studied in this paper. The influence factors of pore development and other aspects were deeply explored. The shales of the Xiamaling formation in the north of Hebei Province are shallow-sea shelf sedimentary facies with a high content of brittle minerals and an organic matter content of more than 4%, and the kerogen type is mainly type I, some of which are type 鈪，

本文編號(hào)：1954677