本文關(guān)鍵詞： 富有機質(zhì)泥頁巖 陸相頁巖油氣 成藏條件 長7油層組 志丹—甘泉地區(qū)　出處：《西安石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：對比北美頁巖油氣成藏地質(zhì)條件發(fā)現(xiàn),鄂爾多斯盆地三疊系延長組長7段發(fā)育一套品質(zhì)很好的泥頁巖,具有一定的頁巖油氣形成條件,但是對頁巖油氣的成藏條件、分布規(guī)律以及評價標準、參數(shù)選取等問題有待深入認識。本論文通過巖心觀察、薄片鑒定、物性測試、有機地球化學測試、X衍射等分析測試結(jié)果,結(jié)合沉積、測井、錄井等資料及前人的研究成果,對鄂爾多斯盆地志丹—甘泉地區(qū)三疊系延長組長7段陸相泥頁巖的成藏條件進行了分析,得到以下成果和認識:延長組長7段泥頁巖主要為半深湖—深湖沉積,厚度由西南向東北逐漸變薄,連續(xù)性較好且分布穩(wěn)定,厚度大的地區(qū)位于盆地的沉積中心;有機碳含量高,84.2%的樣品大于2%,平均值為4.61%,有機質(zhì)熱演化處于成熟階段,Ro主要分布在0.6%~1.1%之間,處于生油窗內(nèi),干酪根類型以I-II1型為主;泥頁巖粘土礦物含量高,巖心樣品平均值為56.3%,以伊蒙混層和伊利石為主,且石英、長石、碳酸鹽礦物等含量低;儲層孔隙度平均為3.34%,基質(zhì)滲透率平均為0.033×10-3μm2;微觀儲集空間類型包括泥質(zhì)粒間孔、粒內(nèi)孔、有機質(zhì)孔及微裂縫,其中有機質(zhì)孔相對不發(fā)育;泥頁巖的蘭氏體積在0.56m3/t~4.43m3/t之間,有機碳含量和粘土礦物(主要是伊利石)含量是影響泥頁巖吸附能力的最重要因素;通過熱成熟度與油氣兩相存在的最大埋深關(guān)系公式,判斷出志丹以南,甘泉以西存在油氣兩相態(tài)。在綜合考量泥頁巖厚度、有機質(zhì)豐度、成熟度以及粘土礦物含量等參數(shù)的基礎(chǔ)上,建立了研究區(qū)富有機質(zhì)泥頁巖儲層評價指標,對研究區(qū)長7段頁巖油氣的有利勘探區(qū)域進行預測,確定出研究區(qū)內(nèi)Ⅰ類和Ⅱ類有利區(qū)。
[Abstract]:In contrast with North American shale reservoir forming geological conditions, it is found that a set of shale with good quality is developed in member 7 of the Triassic Yanchang formation in Ordos Basin, which has certain conditions for the formation of shale oil and gas. However, the conditions of shale oil and gas accumulation, distribution, evaluation criteria, parameter selection and other issues need to be deeply understood. This paper through core observation, thin section identification, physical properties testing, organic geochemical testing. X-ray diffraction analysis and test results, combined with deposition, logging, logging and other data and previous research results. Based on the analysis of the reservoir forming conditions of the terrigenous shale in the 7th member of the Chang Yanchang formation of the Triassic Yanchang formation in the Zhidan-Ganquan area, Ordos Basin, the following results and understandings have been obtained: the shale shale of the formation Yanchang is mainly semi-deep lacustry-deep lake deposition. The thickness is gradually thinned from southwest to northeast, and the continuity is good and the distribution is stable. The area with large thickness is located in the sedimentary center of the basin. The samples with high organic carbon content (84.2%) are larger than 2 (average value is 4.61). The organic matter thermal evolution is mainly distributed between 0.6% and 1.1% in the mature stage and in the oil generation window. The main type of kerogen was I-II1; The content of clay minerals in shale is high, the average value of core samples is 56.3, mainly of immonitic and Illite, and the contents of quartz, feldspar and carbonate minerals are low. The average porosity of reservoir is 3.34 and the average permeability of matrix is 0.033 脳 10 ~ (-3) 渭 m ~ (2); The microreservoir space types include intergranular pore, intergranular pore, organic pore and microfissure, among which the organic pore is relatively undeveloped. The Ranch volume of shale is between 0.56 m3 / t and 4.43 m3 / t, and the content of organic carbon and clay minerals (mainly Illite) are the most important factors affecting the adsorption capacity of shale. Based on the relationship between thermal maturity and the maximum buried depth of oil and gas two phases, it is found that there are two phases of oil and gas to the south of Zhidan and west of Gan Quan. The thickness of shale and the abundance of organic matter are considered synthetically. Based on the parameters of maturity and clay mineral content, the evaluation index of organic matter rich shale reservoir in the study area is established, and the favorable exploration area of shale oil and gas in Chang7 formation is predicted. The favorable regions of class 鈪，

本文編號：1448903