【摘要】：論文以鄂爾多斯盆地南部中生界三疊系延長(zhǎng)組長(zhǎng)7頁(yè)巖儲(chǔ)層作為研究對(duì)象,通過(guò)對(duì)研究區(qū)地質(zhì)資料的大量收集和整理,并充分利用野外露頭、鉆井、錄井、測(cè)井以及薄片分析、掃描電鏡、有機(jī)地球化學(xué)等多種分析測(cè)試手段,深入、系統(tǒng)地研究了鄂爾多斯盆地南部延長(zhǎng)組長(zhǎng)7頁(yè)巖氣儲(chǔ)層特征并對(duì)其進(jìn)行綜合評(píng)價(jià)。研究表明,鄂爾多斯盆地南部延長(zhǎng)組長(zhǎng)7時(shí)期以半深湖-深湖相為主,是富有機(jī)質(zhì)頁(yè)巖發(fā)育的有利相帶。研究區(qū)暗色泥頁(yè)巖厚度較大,分布穩(wěn)定。論文通過(guò)巖性、巖相劃分及X-衍射全巖分析發(fā)現(xiàn),長(zhǎng)7段暗色泥質(zhì)巖系的巖性多為含泥鐵質(zhì)細(xì)粉砂質(zhì)粗粉砂巖、細(xì)粉砂巖、鐵質(zhì)泥巖、炭質(zhì)頁(yè)巖,多為細(xì)粉砂質(zhì)粗粉砂結(jié)構(gòu)。碎屑成分主要為石英、長(zhǎng)石、云母,少量酸性噴出巖、變質(zhì)巖等巖屑,脆性礦物含量相對(duì)較高。長(zhǎng)7暗色泥巖有機(jī)質(zhì)含量高,生烴潛力大。有機(jī)碳含量在0.88~25.46%之間,平均含量4.96%。有機(jī)質(zhì)類(lèi)型以Ⅱ型為主。鏡質(zhì)體反射率在0.52-1.13%之間,進(jìn)入了熱催化生油氣階段。借助掃描電鏡發(fā)現(xiàn),長(zhǎng)7頁(yè)巖孔隙類(lèi)型以粒間微孔及溶蝕微孔為主�？紫抖确植挤秶�0.5%-3.5%之間,以1-2%為主,平均值為1.82%;滲透率以小于0.01×10-3μm2為主。研究區(qū)多口探井在長(zhǎng)7泥巖中氣測(cè)顯示異常,氣體為有機(jī)成因的熱解氣,賦存狀態(tài)以吸附態(tài)、游離態(tài)和溶解態(tài)并存。鉆井取心實(shí)測(cè)含氣量大于2m3/t,含氣量受暗色泥巖厚度、巖相、TOC、礦物組分、保存條件等多因素影響。根據(jù)頁(yè)巖氣成藏條件,借鑒國(guó)內(nèi)外頁(yè)巖氣儲(chǔ)層評(píng)價(jià)標(biāo)準(zhǔn),建立了適合研究區(qū)的頁(yè)巖氣儲(chǔ)層評(píng)價(jià)標(biāo)準(zhǔn)。筆者將暗色泥巖厚度、有機(jī)質(zhì)含量(TOC)以及有機(jī)質(zhì)成熟度(Ro)三個(gè)主要參數(shù)疊合,并綜合考慮埋深、沉積相帶等相關(guān)參數(shù)指標(biāo),預(yù)測(cè)了研究區(qū)延長(zhǎng)組長(zhǎng)7段頁(yè)巖氣的有利目標(biāo)區(qū)及遠(yuǎn)景區(qū),為該區(qū)下一步頁(yè)巖氣的勘探開(kāi)發(fā)提供了借鑒。
[Abstract]:The paper takes the Mesozoic Chang 7 shale reservoir of the Mesozoic Yanchang formation in the southern Ordos Basin as the research object, through collecting and sorting a large amount of geological data in the study area, and making full use of field outcrop, drilling, logging, logging and thin slice analysis. Scanning electron microscope (SEM), organic geochemistry and other analytical and testing methods are used to study the shale gas reservoir characteristics of Yanchang No. 7 formation in the southern Ordos Basin and to evaluate them comprehensively. The results show that in Yanchang formation of southern Ordos Basin, the semi-deep lacustrine-deep lacustrine facies is dominant, which is a favorable facies zone for the development of organic matter rich shale. In the study area, the thickness of dark shale is large and the distribution is stable. Through lithology, lithofacies division and X-ray diffraction analysis, it is found that the lithology of dark shaly rock series in Chang7 formation is mainly composed of fine silty sandstone, iron mudstone, carbonaceous shale and fine silty coarse silt structure. The clastic components are mainly quartz, feldspar, mica, a small amount of acid exhalation rock, metamorphic rock and so on, and the content of brittle minerals is relatively high. Chang7 dark mudstone has high organic matter content and great hydrocarbon generation potential. The organic carbon content was between 0.88% and 25.46%, and the average content was 4.96%. The type of organic matter is mainly type 鈪，

本文編號(hào)：2221182