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川南地區(qū)龍馬溪組頁巖有機質孔隙差異化發(fā)育特征及其對儲集空間的影響
高之業(yè),,范毓鵬,胡欽紅,,姜振學,,黃志龍,王乾右,,成雨
1 中國石油大學( 北京) 油氣資源與探測國家重點實驗室,,北京 102249 2 中國石油大學( 北京) 非常規(guī)油氣科學技術研究院,北京 102249 3 德克薩斯大學阿靈頓分校,,美國阿靈頓 76019 4 中國石油大學( 北京) 地球科學學院,,北京 102249
Differential development characteristics of organic matter pores and their impact on reservoir space of Longmaxi Formation shale from the south Sichuan Basin
GAO Zhiye, FAN Yupeng, HU Qinhong, JIANG Zhenxue, HUANG Zhilong, WANG Qianyou,CHENG Yu
1 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China 2 Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China 3 The University of Texas at Arlington, Arlington 76019, USA 4 School of Earth Sciences, China University of Petroleum-Beijing, Beijing 102249, China

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摘要? 頁巖儲層孔隙結構控制著頁巖氣的富集和運移,特別是有機質孔隙是頁巖氣重要的貯存空間,,而不同組分有機質內部的孔隙結構特征尚不明確,,亟需開展相關研究。本研究以川南地區(qū)長寧、瀘州和渝西區(qū)塊龍馬溪組頁巖為研究對象,,開展有機地化和礦物組成分析并劃分頁巖巖相,,利用場發(fā)射掃描電鏡并結合相關圖像處理軟件對頁巖儲層有機質孔隙結構進行定量化表征,利用氮氣吸附和高壓壓汞實驗對各區(qū)塊不同巖相頁巖樣品孔隙結構進行聯(lián)合定量表征,。結果顯示,,根據(jù)有機質孔隙發(fā)育程度和特征,川南地區(qū)頁巖的有機質類型可分為A,、B,、C、D,、E類型,,有機質顯微組分、礦物組成,、異常壓力的不同導致有機質的孔隙形態(tài),、孔徑、面孔率等孔隙結構參數(shù)存在較大差異,。有機質孔隙差異化發(fā)育是導致頁巖儲集空間不同的重要原因,,以B、D類型有機質為主的長寧區(qū)塊頁巖樣品孔隙最為發(fā)育,,以A,、B,、D類型有機質為主的瀘州區(qū)塊次之,,以B、C有機質為主的渝西區(qū)塊孔隙發(fā)育程度最差,。本研究成果對完善頁巖儲層評價,,優(yōu)選有利頁巖巖相具有重要的意義。
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關鍵詞 : 四川盆地;龍馬溪組頁巖,;孔隙結構,;有機質類型;有機質孔隙
Abstract

The pore structure of shale reservoirs controls the enrichment and migration of shale gas and the organic matter (OM) pores are an important gas storage space. As the pore structure characteristics of different components of organic matter are still unclear, relevant research is urgently needed. This study takes the Longmaxi Formation shales of the Changning, Luzhou and Yuxi blocks in the southern Sichuan Basin as the research objects, and divides Longmaxi Formation shale samples into different lithofacies based on organic geochemical and mineral composition analyses. Field emission-scanning electron microscopy (FESEM),in combination with image-processing software, is used for quantitative characterization of OM pore structure within theshale samples. The pore structure parameters of shale samples with different lithofacies from different blocks are obtained by N2 adsorption and high pressure mercury intrusion porosimetry experiments. The results show that OM with different pore structure characteristics can be divided into Type A, Type B, Type C, Type D and Type E. The difference of organic macerals, mineral composition and abnormal pressure lead to the distinctive OM pore structure parameters such as pore diameter, area porosity and morphology. The differential development of OM pores is an important factor causing different reservoir spaces for different shales. The reservoir space of shale samples in the Changning block dominated by Type B and Type D OMs is the most developed,followed by shale samples in the Luzhou block dominated by Types A, B and D, and the reservoir space of shale samples in the Yuxi block dominated by Types B and C is the least developed. The outcomes of this work are significant for improving shale reservoir evaluation and selecting optimal shale lithofacies.

Key words: Sichuan Basin; Longmaxi Formation shale; pore structure; organic matter type; organic matter pores
收稿日期: 2020-03-28 ????
PACS: ? ?
基金資助:本文由國家科技重大專項(2017ZX05035-002),、中國石油大學( 北京) 油氣資源與探測國家重點實驗室(PRP/indep-3-1707,、PRP/indep-03-1615) 聯(lián)合資助
通訊作者: [email protected]
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高之業(yè), 范毓鵬, 胡欽紅, 姜振學, 黃志龍, 王乾右, 成雨. 川南地區(qū)龍馬溪組頁巖有機質孔隙差異化發(fā)育特征及其對儲集空間的 影響. 石油科學通報, 2020, 01: 1-16
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GAO Zhiye, FAN Yupeng, HU Qinhong, JIANG Zhenxue, HUANG Zhilong, WANG Qianyou, CHENG Yu. Differential development characteristics of organic matter pores and their impact on reservoir space of Longmaxi Formation shale from the south Sichuan Basin. Petroleum Science Bulletin, 2020, 01: 1-16.
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