【摘要】：早泥盆世埃姆斯期至早石炭世杜內期,南丹-河池一線為獨特的臺間盆地環(huán)境,位于桂中坳陷西部邊緣,自下而上發(fā)育塘丁組、羅富組、榴江組、五指山組和鹿寨組含磷、錳的泥質、硅質和扁豆狀的灰?guī)r沉積。其中羅富組發(fā)育有連續(xù)的,具有一定沉積厚度的黑色、深灰色、灰黑色泥頁巖沉積,具有頁巖氣開發(fā)潛力。針對南丹地區(qū)泥盆紀剖面羅富組進行的實測和沉積學分析能夠更進一步的評價其中羅富組沉積的頁巖氣前景,研究共采集樣品120件,采樣間距為2m~3m。泥頁巖層位選擇其中10件含有機質樣品進行有機質特征、礦物成分、孔隙度、孔隙結構等測試,20件樣品用于電鏡分析,80件樣品進行薄片鑒定分析。綜合野外露頭剖面測量和樣品地球化學測試及微孔結構觀察結果,確定南丹地區(qū)羅富組下段具備形成頁巖氣的資源基礎和優(yōu)越的成藏條件。羅富組厚約330m,以富硅質泥頁巖的首現(xiàn),將之劃為上、下兩段。羅富組下段有機質豐度高(TOC分布于1.64%~3.69%之間),成熟度小于3.6%(Ro值介于3.14%~4.19%),泥頁巖厚度大(大于100m),儲層微孔隙發(fā)育,脆性礦物含量合適(介于48%~58%),黏土礦物之中不含蒙皂石。將研究剖面頁巖氣儲層的地化、物性特征及沉積厚度與北美及四川頁巖氣對比,判斷研究區(qū)中泥盆統(tǒng)羅富組下段具有較好的頁巖氣勘探潛力。
[Abstract]:From early Devonian to early Carboniferous, the Nandan Hechi line is a unique inter-platform basin environment, which is located at the western margin of the central Guangxi depression. It is developed from the bottom to the top of the Tangding formation, Luofu formation, Shuijiang formation, Wuzhishan formation and Luzhai formation. Manganese muddy, siliceous, and lentil-like limestone deposits. Among them, Luofu formation has continuous black, dark gray and gray shale deposits with a certain sedimentary thickness, which has the potential of shale gas development. According to the actual measurement and sedimentological analysis of Luofu formation in Devonian section of Nandan area, the prospect of shale gas deposited in Luofu formation can be further evaluated. A total of 120 samples were collected with a sampling interval of 2 mm2. Ten samples containing organic matter were selected for organic matter characteristics, mineral composition, porosity, pore structure and so on. 20 samples were used for electron microscope analysis, 80 samples for thin slice identification and analysis. Based on the results of outcrop profile measurements, geochemical measurements of samples and observation of micropore structure, it is determined that the lower member of the Luofu formation in Nandan area has a resource base for shale gas formation and favorable conditions for reservoir formation. The Luofu formation is about 330 m thick, with the first occurrence of siliceous shale, which is divided into the upper and lower sections. The lower member of Luofu formation has a high abundance of organic matter (TOC is between 1.64% and 3.69%), a maturity of less than 3.6% (Ro value is between 3.14% and 4.19%), a large thickness of shale (> 100m), a development of reservoir micropores, a suitable content of brittle minerals (between 48% and 58%), and no montmorillonite in clay minerals. The geochemical, physical properties and sedimentary thickness of shale gas reservoirs in the study section are compared with those in North America and Sichuan, and the lower member of Luofu formation of the middle Devonian in the study area has good shale gas exploration potential.
【作者單位】： 中國地質大學;中國地質調查局油氣資源調查中心;油氣藏地質及開發(fā)工程國家重點實驗室成都理工大學;成都理工大學沉積地質研究院;
【基金】：中國地質調查局油氣資源調查中心“大南盤江地區(qū)泥盆、石炭系富有機質頁巖層系沉積特征及巖相古地理編圖”(編號:12120115005101)
【分類號】：P618.13

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本文編號：2256963