發(fā)布時間：2018-02-12 09:44

  本文關(guān)鍵詞： 頁巖氣 孔隙 裂縫 龍馬溪組 湘西北保靖地區(qū)　出處：《巖性油氣藏》2017年03期 　論文類型：期刊論文

【摘要】：湘西北保靖地區(qū)龍馬溪組富有機質(zhì)泥頁巖是重要的頁巖氣勘探層位。為研究其頁巖氣儲層特征和氣體賦存規(guī)律,利用礦物組分、有機地球化學(xué)、物性、含氣性、等溫吸附、掃描電鏡和Nano-CT掃描等測試資料,并結(jié)合野外地質(zhì)調(diào)查,分析和探討了龍馬溪組巖相特征、儲層特征及儲層含氣性主控因素。結(jié)果表明:龍馬溪組發(fā)育3種巖相,分別為炭質(zhì)-粉砂質(zhì)泥頁巖相、炭質(zhì)泥頁巖相、含炭泥質(zhì)粉砂巖相;儲層孔隙類型主要包括粒間孔、溶蝕孔、晶間孔、化石孔、有機質(zhì)孔和微裂縫,其中裂縫類型主要為構(gòu)造縫和成巖縫;孔隙按孔徑大小可分為微孔、介孔和宏孔,介孔占總孔容的比重最大,其次是微孔,宏孔最少。綜合分析認(rèn)為:微孔孔容、頁巖比表面積與甲烷最大吸附量呈正相關(guān)性,受控于頁巖有機質(zhì)含量(TOC);微裂縫與頁巖含氣量也呈正相關(guān)性,說明微裂縫的發(fā)育程度對頁巖含氣性具有影響作用。利用Nano-CT掃描結(jié)果,認(rèn)為絕大部分氣體流動空間位于有機質(zhì)孔隙以及微裂縫中。TOC和微裂縫的發(fā)育程度是該區(qū)龍馬溪組頁巖氣富集的主控因素。
[Abstract]:The organic clay shale of Longmaxi formation is an important exploration horizon of shale gas in Baojing area, northwest of Hunan Province. In order to study its shale gas reservoir characteristics and gas occurrence law, mineral components, organic geochemistry, physical properties, gas-bearing properties, isothermal adsorption are used. The lithofacies characteristics, reservoir characteristics and main controlling factors of gas-bearing properties of the Longmaxi formation are analyzed and discussed in combination with the test data of scanning electron microscope and Nano-CT scanning, and combined with field geological investigation. The results show that three lithofacies are developed in the Longmaxi formation. The reservoir pore types mainly include intergranular pore, dissolved pore, intergranular pore, fossil pore, organic pore and microfracture. The fracture types are mainly structural fractures and diagenetic fractures, the pores can be divided into micropores, mesoporous and macro pores according to pore size, the proportion of mesoporous to total pore volume is the largest, followed by micropore and macro pore. The specific surface area of shale is positively correlated with the maximum adsorption capacity of methane, which is controlled by the content of organic matter in shale, and the microfracture is positively correlated with the gas content of shale. It shows that the development of microfractures has an effect on the gas content of shale. Using the Nano-CT scanning results, It is considered that most of the gas flow space is located in the pores of organic matter, and the development of .TOC and microfractures in the micro-fractures is the main controlling factor for shale gas enrichment in Longmaxi formation in this area.
【作者單位】： 神華地質(zhì)勘查有限責(zé)任公司;中國石油大學(xué)(北京)非常規(guī)天然氣研究院;
【基金】：國家自然科學(xué)基金項目“云質(zhì)巖致密油儲層微米—納米孔喉網(wǎng)絡(luò)體系及其流體耦合流動機理與流動下限”(編號:41372145)資助
【分類號】：P618.13

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