本文選題：東部盆地群 + 下白堊統(tǒng)　； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：松遼盆地東部盆地群下白堊統(tǒng)泥頁巖是一套有利的勘探目的層,在通化盆地通D1井頁巖和致密砂巖中均見到良好的油氣顯示,預(yù)示著該地區(qū)具有常規(guī)油氣和非常規(guī)油氣勘探的前景,因此,研究該地區(qū)下白堊統(tǒng)泥頁巖具有長遠(yuǎn)的意義。目前,泥頁巖的定義尚未統(tǒng)一,本文中的泥頁巖是一個統(tǒng)稱,主要包括泥巖和頁巖。由于泥頁巖這一特殊的概念,在已有的資料基礎(chǔ)上,搜集和實(shí)測了東部盆地群下白堊統(tǒng)泥頁巖大量的地化數(shù)據(jù)和巖石學(xué)特征數(shù)據(jù),本文試圖通過泥頁巖的巖石學(xué)特征、地化特征和封閉能力三個方面,研究泥頁巖“源”和“蓋”的特征。結(jié)果表明,研究區(qū)下白堊統(tǒng)泥頁巖主要發(fā)育于濱淺湖相和半-深湖相。北部下白堊統(tǒng)沉積水體較淺,泥頁巖厚度變化大、粉砂質(zhì)含量高;南部沉積水體較深,泥頁巖厚度變化較小,粉砂質(zhì)含量低。通過泥頁巖XRD、掃描電鏡和液態(tài)氮吸附實(shí)驗(yàn)發(fā)現(xiàn),研究區(qū)下白堊統(tǒng)泥頁巖脆性礦物含量(≥40%)較高,有利于在外力作用下形成裂縫,總脆度受到石英礦物含量的影響,與Barnett等北美頁巖氣儲層礦物含量具有很好的對比性。下白堊統(tǒng)泥頁巖中有裂縫發(fā)育,其中有機(jī)質(zhì)孔發(fā)育受控于有機(jī)質(zhì)熱演化程度,當(dāng)Ro0.8%時,研究區(qū)下白堊統(tǒng)泥頁巖有機(jī)質(zhì)孔開始發(fā)育,隨著有機(jī)質(zhì)熱演化程度的增加,有機(jī)質(zhì)孔增多,但具有一定的臨界值,當(dāng)Ro≥4.0%時,有機(jī)質(zhì)孔減少。發(fā)育的孔喉類型主要為微孔-中孔,不具有連通性,不會影響其封閉能力,但確有利于產(chǎn)生的頁巖氣吸附在泥頁巖中。通過地化數(shù)據(jù)的分析,研究區(qū)下白堊統(tǒng)泥頁巖具有一定的生烴能力,且南部泥頁巖品質(zhì)好于北部。北部有機(jī)質(zhì)豐度達(dá)到了中等偏差,干酪根主要為Ⅱ2-Ⅲ型,目前處于成熟-高熟階段,易于生氣;南部泥頁巖有機(jī)質(zhì)豐度較高,達(dá)到中等偏好的水平,干酪根主要為I-Ⅱ2型,目前處于低熟-成熟階段,易于生油和生氣。與國內(nèi)外泥頁巖地化特征對比,下白堊統(tǒng)泥頁巖樣品大部分落在了TOC=1.0%~24.0%、Ro=0.4%~1.8%的范圍內(nèi),具有生成頁巖氣的潛力。研究區(qū)下白堊統(tǒng)直接蓋層和區(qū)域蓋層的巖性不僅僅是泥頁巖,同時還有火山巖和凝灰?guī)r,但本文以討論泥頁巖為主,主要包括粉砂質(zhì)泥巖、泥巖、頁巖和泥質(zhì)粉砂巖。發(fā)與蓋層的成巖階段主要處于中成巖階段A1亞期-中成巖階段A2亞期,排替壓力較大,封閉性主要處于中-好、好和好-中三個等級,封閉能力較好。根據(jù)源控論和蓋層保存條件控制成藏理論,結(jié)合研究區(qū)下白堊統(tǒng)泥頁巖巖石學(xué)特征、地化特征和封閉特征的討論結(jié)果,表明該研究區(qū)南部更具有勘探開發(fā)的價值。
[Abstract]:The Lower Cretaceous shale is a favorable exploration target layer in the eastern Songliao Basin, and good oil and gas display is found in TongD1 well shale and tight sandstone in Tonghua Basin. It indicates that there are prospects for conventional and unconventional oil and gas exploration in this area, so it is of long-term significance to study the Lower Cretaceous shale in this area. At present, the definition of shale is not uniform, the shale in this paper is a general term, mainly including mudstone and shale. Because of the special concept of shale, based on the existing data, a large number of geochemistry and petrological data of the Lower Cretaceous shale in the eastern basin group were collected and measured. This paper attempts to analyze the petrological characteristics of the shale. The characteristics of shale "source" and "cap" are studied in three aspects: geochemical characteristics and sealing capacity. The results show that shales of Lower Cretaceous are mainly developed in littoral shallow lacustrine facies and semi-deep lacustrine facies in the study area. The lower Cretaceous sedimentary water body in the north is shallow, the shale thickness changes greatly, and the silty sand content is high, while the sedimentary water body in the south is deeper, the shale thickness is small, and the silty sand content is low. By means of XRD, SEM and nitrogen adsorption experiments, it is found that the lower Cretaceous shale has a higher brittle mineral content (鈮，

本文編號：1936380