鄂尔多斯盆地东南部长7段页岩孔隙特征及其控制因素

doi:10.7657/XJPG20220102

摘要/Abstract

摘要：

为明确鄂尔多斯盆地长7段陆相页岩储集层孔隙特征,通过扫描电镜、铸体薄片、气体吸附法和压汞法等实验手段,对长7段页岩储集层中纯页岩和粉砂质纹层发育的页岩孔隙特征进行了对比分析,并探讨了可能影响孔隙发育的因素。纯页岩中主要发育黏土矿物粒间孔和有机孔,粉砂质纹层发育页岩中主要发育粒间孔和粒内溶孔;相比纯页岩,粉砂质纹层的中—大孔发育,孔隙度、孔径和孔体积均较大。纯页岩孔隙的发育主要受控于刚性颗粒和有机质含量,粉砂质纹层页岩孔隙的发育主要受控于保存条件,如石英和长石等刚性颗粒的富集利于孔隙保存,酸性流体对长石的溶蚀具有增孔作用,液态烃包裹矿物抑制胶结作用的发生。粉砂质纹层发育的页岩孔隙结构和物性优于纯页岩,在页岩油气勘探中应重点关注粉砂质纹层发育段。

关键词: 鄂尔多斯盆地, 延长组, 长7段, 页岩, 粉砂质纹层, 孔隙特征, 控制因素

Abstract:

In order to identify the pore characteristics of the continental shale in the seventh member of Yanchang formation (Chang 7 member) in southeastern Ordos basin, the shale cores taken from pure shale and silty laminae of Chang 7 member were analyzed for pore characteristics with the aid of experimental methods such as SEM, cast slice, gas adsorption method, and mercury intrusion, and the factors that may affect pore development were discussed. The results show that pure shale mainly contains clay mineral intergranular pores and organic pores, and silty laminae holds intergranular pores and intragranular dissolved pores. Compared with pure shale, silty laminae has mesopores-macropores with larger porosity, pore diameter and pore volume. In pure shale, the development of pores is mainly controlled by the contents of rigid particle and organic matter. In silty laminate, the controlling factors for shale pore development are mainly the preservation conditions. For instance, the enrichment of rigid particles such as quartz and feldspar is conducive to pore preservation, acidic fluid can corrode feldspar to create more pores, and liquid hydrocarbons can wrap minerals to inhibit cementation. The shale in silty laminae is superior to pure shale with respect to pore structure and physical properties. Thus, the silty laminae zones should be paid more attention in shale oil/gas exploration.

Key words: Ordos basin, Yanchang formation, Chang 7 member, shale, silty laminae, pore characteristic, controlling factor

中图分类号:

TE122.23

曹尚, 李树同, 党海龙, 邢海雪, 张丽霞, 张天龙, 白璞. 鄂尔多斯盆地东南部长7段页岩孔隙特征及其控制因素[J]. 新疆石油地质, 2022, 43(1): 11-17.

CAO Shang, LI Shutong, DANG Hailong, XING Haixue, ZHANG Lixia, ZHANG Tianlong, BAI Pu. Pore Characteristics and Controlling Factors of Chang 7 Shale in Southeastern Ordos Basin[J]. Xinjiang Petroleum Geology, 2022, 43(1): 11-17.

图/表 6

图1

图2

表1

图3

图4

图5

参考文献 23

[1]	张才利, 刘新社, 杨亚娟, 等. 鄂尔多斯盆地长庆油田油气勘探历程与启示[J]. 新疆石油地质, 2021, 42(3):253-263.
	ZHANG Caili, LIU Xinshe, YANG Yajuan, et al. Petroleum exploration history and enlightenment of Changqing oilfield in Ordos basin[J]. Xinjiang Petroleum Geology, 2021, 42(3):253-263.
[2]	王香增, 高胜利, 高潮. 鄂尔多斯盆地南部中生界陆相页岩气地质特征[J]. 石油勘探与开发, 2014, 41(3):294-304.
	WANG Xiangzeng, GAO Shengli, GAO Chao. Geological features of Mesozoic continental shale gas in south of Ordos basin,NW China[J]. Petroleum Exploration and Development, 2014, 41(3):294-304.
[3]	王香增, 张金川, 曹金舟, 等. 陆相页岩气资源评价初探:以延长直罗—下寺湾区中生界长7段为例[J]. 地学前缘, 2012, 19(2):192-197.
	WANG Xiangzeng, ZHANG Jinchuan, CAO Jinzhou, et al. A preliminary discussion on evaluation of continental shale gas resources:a case study of Chang 7 of Mesozoic Yanchang formation in Zhiluo-Xiasiwan area of Yanchang[J]. Earth Science Frontiers, 2012, 19(2):192-197.
[4]	董国良. 鄂尔多斯盆地镇泾区块延长组长7页岩储层评价[D]. 成都:成都理工大学, 2012.
	DONG Guoliang. The evaluation of Chang 7 shale gas reservoir characteristics of Yanchang formation in Zhenyuan and Jingchuan area,Ordos basin[D]. Chengdu:Chengdu University of Technology, 2012.
[5]	吴泓辰, 何金先, 张晓丽, 等. 鄂尔多斯盆地临兴地区太原组页岩孔隙结构及分形特征[J]. 新疆石油地质, 2018, 39(5):549-554.
	WU Hongchen, HE Jinxian, ZHANG Xiaoli, et al. Pore structure and its fractal features of the shale in Taiyuan formation of Linxing area,Ordos basin[J]. Xinjiang Petroleum Geology, 2018, 39(5):549-554.
[6]	ROSS D J K, BUSTIN R M. Characterizing the shale gas resource potential of Devonian-Mississippian strata in the Western Canada sedimentary basin:application of an integrated formation evaluation[J]. AAPG Bulletin, 2008, 92(1):87-125. doi: 10.1306/09040707048
[7]	陈尚斌, 朱炎铭, 王红岩, 等. 川南龙马溪组页岩气储层纳米孔隙结构特征及其成藏意义[J]. 煤炭学报, 2012, 37(3):438-444.
	CHEN Shangbin, ZHU Yanming, WANG Hongyan, et al. Structure characteristics and accumulation significance of nanopores in Longmaxi shale gas reservoir in the southern Sichuan basin[J]. Journal of China Coal Society, 2012, 37(3):438-444.
[8]	谢晓永, 唐洪明, 王春华, 等. 氮气吸附法和压汞法在测试泥页岩孔径分布中的对比[J]. 天然气工业, 2006, 26(12):100-102.
	XIE Xiaoyong, TANG Hongming, WANG Chunhua, et al. Comparison of nitrogen adsorption method and mercury injection method in testing pore size distribution of shale[J]. Natural Gas Industry, 2006, 26(12):100-102.
[9]	付小平, 杨滔. 川东北地区下侏罗统自流井组陆相页岩储层孔隙结构特征[J]. 石油实验地质, 2021, 43(4):589-598.
	FU Xiaoping, YANG Tao. Pore structure of continental shale reservoirs in Lower Jurassic Ziliujing formation, northeastern Sichuan basin[J]. Petroleum Geology & Experiment, 2021, 43(4):589-598.
[10]	姜呈馥, 王香增, 张丽霞, 等. 鄂尔多斯盆地东南部延长组长7段陆相页岩气地质特征及勘探潜力评价[J]. 中国地质, 2013, 40(6):1 880-1 888.
	JIANG Chengfu, WANG Xiangzeng, ZHANG Lixia, et al. Geological characteristics and exploration potential evaluation of continental shale gas in Chang 7 member of Yanchang formation in southeast Ordos basin[J]. Geology in China, 2013, 40(6):1 880-1 888.
[11]	刘树根, 焦堃, 张金川, 等. 深层页岩气储层孔隙特征研究进展:以四川盆地下古生界海相页岩层系为例[J]. 天然气工业, 2021, 41(1):29-41.
	LIU Shugen, JIAO Kun, ZHANG Jinchuan, et al. Research progress on the pore characteristics of deep shale gas reservoirs: an example from the Lower Paleozoic marine shale in the Sichuan basin[J]. Natural Gas Industry, 2021, 41(1):29-41.
[12]	耳闯, 赵靖舟, 白玉彬, 等. 鄂尔多斯盆地三叠系延长组富有机质泥页岩储层特征[J]. 石油与天然气地质, 2013, 34(5):708-715.
	ER Chuang, ZHAO Jingzhou, BAI Yubin, et al. Reservoir characteristics of the organic-rich shales of the Triassic Yanchang formation in Ordos basin[J]. Oil & Gas Geology, 2013, 34(5):708-715.
[13]	曾秋楠, 于炳松, 李昱霏. 鄂尔多斯盆地东南部延长组页岩储层特征及控制因素[J]. 特种油气藏, 2013, 20(1):23-26.
	ZENG Qiunan, YU Bingsong, LI Yufei. Shale reservoir characteristics and controlling factors of Yanchang formation in southeast Ordos basin[J]. Special Oil & Gas Reservoirs, 2013, 20(1):23-26.
[14]	赵谦平, 张丽霞, 尹锦涛, 等. 含粉砂质层页岩储层孔隙结构和物性特征:以张家滩陆相页岩为例[J]. 吉林大学学报(地球科学版), 2018, 48(4):1 018-1 029.
	ZHAO Qianping, ZHANG Lixia, YIN Jintao, et al. Pore structure and physical characteristics of shale reservoir interbedded with silty layers:an example from Zhangjiatan lacustrine shale[J]. Journal of Jilin University (Earth Science Edition), 2018, 48(4):1 018-1 029.
[15]	程明, 罗晓容, 雷裕红, 等. 鄂尔多斯盆地张家滩页岩粉砂质夹层/纹层分布、分形特征和估算方法研究[J]. 天然气地球科学, 2015, 26(5):845-854.
	CHENG Ming, LUO Xiaorong, LEI Yuhong, et al. The distribution,fractal characteristic and thickness estimation of silty laminae and beds in the Zhangjiatan shale,Ordos basin[J]. Natural Gas Geoscience, 2015, 26(5):845-854.
[16]	孙建博, 孙兵华, 赵谦平, 等. 鄂尔多斯盆地富县地区延长组长7湖相页岩油地质特征及勘探潜力评价[J]. 中国石油勘探, 2018, 23(6):29-37.
	SUN Jianbo, SUN Binghua, ZHAO Qianping, et al. Geological characteristics and exploration potential evaluation of Chang 7 lacustrine shale oil in Yanchang formation,Fuxian area,Ordos basin[J]. China Petroleum Exploration, 2018, 23(6):29-37.
[17]	LEI Yuhong, LUO Xiaorong, WANG Xiangzeng, et al. Characteristics of silty laminae in Zhangjiatan shale of southeastern,Ordos basin,China:implications for shale gas formation[J]. AAPG Bulletin, 2015, 99(4):661-687. doi: 10.1306/09301414059
[18]	宿晓岑, 巩磊, 高帅, 等. 陇东地区长7段致密储集层裂缝特征及定量预测[J]. 新疆石油地质, 2021, 42(2):161-167.
	SU Xiaocen, GONG Lei, GAO Shuai, et al. Characteristics and quantitative prediction of fractures of tight reservoir in Chang 7 member in Longdong area[J]. Xinjiang Petroleum Geology, 2021, 42(2):161-167.
[19]	CHALMERS G R, BUSTIN R M, POWER I M. Characterization of gas shale pore systems by porosimetry,pycnometry,surface area,and field emission scanning electron microscopy/transmission electron microscopy image analyses:examples from the Barnett,Woodford,Haynesville,Marcellus,and Doig units[J]. AAPG Bulletin, 2012, 96(6):1 099-1 119. doi: 10.1306/10171111052
[20]	吴辰泓, 张丽霞, 高潮. 下寺湾地区延长组陆相页岩孔隙特征及影响因素[J]. 西安科技大学学报, 2018, 38(6):990-998.
	WU Chenhong, ZHANG Lixia, GAO Chao. Pore characteristics and influential factors on lacustrine shale in Yanchang formation,Xiasiwan area[J]. Journal of Xi’an University of Science and Technology, 2018, 38(6):990-998.
[21]	肖铁全, 田川川, 任海姣. 鄂尔多斯盆地延安气田延长地区石盒子组八段沉积微相及其控气性[J]. 长江大学学报(自然科学版), 2017, 14(7):20-24.
	XIAO Tiequan, TIAN Chuanchuan, REN Haijiao. Sedimentary microfacies and their effects on gas accumulation in Shihezi 8 section of Yan’an gasfield,Ordos basin[J]. Journal of Yangtze University(Natural Science Edition), 2017, 14(7):20-24.
[22]	宋兴沛, 刘洛夫, 徐正建, 等. 鄂尔多斯盆地中西部长7段烃源岩及致密油潜力评价[J]. 新疆石油地质, 2017, 38(5):553-558.
	SONG Xingpei, LIU Luofu, XU Zhengjian, et al. Evaluation of source rocks and tight oil exploration potential of Chang-7 member in central and western Ordos basin[J]. Xinjiang Petroleum Geology, 2017, 38(5):553-558.
[23]	徐红卫, 李贤庆, 祁帅, 等. 鄂尔多斯盆地延长探区延长组页岩气储层孔隙结构特征[J]. 现代地质, 2017, 31(2):328-337.
	XU Hongwei, LI Xianqing, QI Shuai, et al. Pore structure characteristics of Yanchang formation shale gas reservoir in Yanchang exploration area of Ordos basin[J]. Geoscience, 2017, 31(2):328-337.