玛湖凹陷风城组页岩油富集机制与甜点段优选

doi:10.7657/XJPG20220601

摘要/Abstract

摘要：

准噶尔盆地玛湖凹陷风城组为碱湖沉积，自下而上划分为风一段、风二段和风三段，岩性纵向上变化快，矿物成分复杂，富有机质，发育源储一体页岩油藏。油藏整体含油，但甜点分散，单层试油效果不理想，提产潜力不明确。根据岩心薄片及地球化学分析，玛湖凹陷风城组以纹层状粉砂质泥页岩夹白云岩为主，矿物组成以陆源碎屑矿物及碳酸盐矿物为主，随埋深孔隙体积变化和孔表面积变化一致，孔隙体积主要由宏孔（孔隙直径大于50 nm）贡献；烃源岩有机质类型以Ⅱ型为主，镜质体反射率为0.85%~1.40%，处于生油高峰期；风二段发育中—高角度剪切裂缝，风三段发育中—高角度剪切裂缝和低角度构造裂缝，其形成与发育程度受岩性、矿物组分、岩石力学性质等的控制。综合岩性组合及储集层物性、含油性等特征，划分出4个相对集中的甜点段。应在直井多段试油试采的同时，选择含油性好、裂缝较发育的甜点段，开展地质基础研究与地质工程一体化技术攻关，实施水平井提产试验，以实现研究区风城组页岩油勘探开发的全面突破。

关键词: 玛湖凹陷, 风城组, 碱湖烃源岩, 含油性, 储集性, 可动性, 可压性, 有利层段

Abstract:

The Fengcheng formation in the Mahu sag is an alkaline lake sediment，and is divided into Feng 1 member，Feng 2 member and Feng 3 member from bottom to top. In the Fengcheng formation，the lithology vertically changes rapidly，the mineral composition is complex，and the organic-rich shale source is integrated with the shale reservoir. The formation bears oil universally，but the sweet spots are scattered. The results of formation testing for single layers are not satisfied，showing an unclear production potential. According to core slices and geochemical analyses，the Fengcheng formation in the Mahu sag is dominated by lamellar silty shale intercalated with dolomite，which are mainly composed of terrigenous clastic minerals and carbonate minerals. With the variation of burial depth，the pore volume changes consistently with the variation of surface area of pores，and the pore volume is mainly contributed by macropores (pore diameter > 50 nm). The source rock is dominated by Type Ⅱ organic matter，and the vitrinite reflectance ranges from 0.85% to 1.40%，indicating a peak oil generation period. There are many shear fractures with middle to high angles in the Feng 2 member，and shear fractures with middle to high angles and structural fractures with low angles in the Feng 3 member，whose formation and development degree are controlled by lithology，mineral composition，rock mechanical properties，etc. Based on the characteristics of lithologic assemblage，reservoir property and oil-bearing property，four relatively concentrated sweet spots have been identified. When performing multi-interval formation testing and production testing in vertical wells，it is necessary to select sweet spots with good oil content and more fractures to conduct geological research and geology-engineering integration technology research，and to perform production improvement tests in horizontal wells，so as to realize comprehensive breakthrough for shale oil exploration and development in the Fengcheng formation in the study area

Key words: Mahu sag, Fengcheng formation, alkaline-lacustrine source rock, oil-bearing property, reservoir property, mobility, fracability, favorable interval

中图分类号:

TE122.23

金之钧, 梁新平, 王小军, 朱如凯, 张元元, 刘国平, 高嘉洪. 玛湖凹陷风城组页岩油富集机制与甜点段优选[J]. 新疆石油地质, 2022, 43(6): 631-639.

JIN Zhijun, LIANG Xinping, WANG Xiaojun, ZHU Rukai, ZHANG Yuanyuan, LIU Guoping, GAO Jiahong. Shale Oil Enrichment Mechanism and Sweet Spot Selection of Fengcheng Formation in Mahu Sag，Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(6): 631-639.

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参考文献 32

[1]	金之钧, 蔡勋育, 刘金连, 等. 中国石油化工股份有限公司近期勘探进展与资源发展战略[J]. 中国石油勘探, 2018, 23(1):14-25. doi: 10.3969/j.issn.1672-7703.2018.01.002
	JIN Zhijun, CAI Xunyu, LIU Jinlian, et al. The recent exploration progress and resource development strategy of China Petroleum and Chemical Corporation[J]. China Petroleum Exploration, 2018, 23(1):14-25. doi: 10.3969/j.issn.1672-7703.2018.01.002
[2]	金之钧, 白振瑞, 高波, 等. 中国迎来页岩油气革命了吗?[J]. 石油与天然气地质, 2019, 40(3):451-458.
	JIN Zhijun, BAI Zhenrui, GAO Bo, et al. Has China ushered in the shale oil and gas revolution?[J]. Oil & Gas Geology, 2019, 40(3):451-458.
[3]	赵文智, 胡素云, 侯连华, 等. 中国陆相页岩油类型、资源潜力及与致密油的边界[J]. 石油勘探与开发, 2020, 47(1):1-10
	ZHAO Wenzhi, HU Suyun, HOU Lianhua, et al. Types and resource potential of continental shale oil in China and its boundary with tight oil[J]. Petroleum Exploration and Development, 2020, 47(1):1-10. doi: 10.1016/S1876-3804(20)60001-5
[4]	金之钧, 高德利, 贾承造, 等. 中国页岩油发展战略研究[R]. 北京: 中国科学院学部, 2019.
	JIN Zhijun, GAO Deli, JIA Chengzao, et al. Research on China’s shale oil development strategy[R]. Beijing: Faculty of Chinese Academy of Sciences, 2019.
[5]	JIN Zhijun, ZHU Rukai, LIANG Xinping, et al. Several issues worthy of attention in current lacustrine shale oil exploration and development[J]. Petroleum Exploration and Development, 2021, 48(6):1276-1 287.
[6]	JIN Zhijun, LIANG Xinping, BAI Zhenrui. Exploration breakthrough and its significance of Gulong lacustrine shale oil in the Songliao basin,northeastern China[J]. Energy Geoscience, 2022, 3(2):120-125. doi: 10.1016/j.engeos.2022.01.005
[7]	胡素云, 赵文智, 侯连华, 等. 中国陆相页岩油发展潜力与技术对策[J]. 石油勘探与开发, 2020, 47(4):1-10.
	HU Suyun, ZHAO Wenzhi, HOU Lianhua, et al. Development potential and technical strategy of continental shale oil in China[J]. Petroleum Exploration and Development, 2020, 47(4):1-10. doi: 10.1016/S1876-3804(20)60001-5
[8]	匡立春, 唐勇, 雷德文, 等. 准噶尔盆地二叠系咸化湖相云质岩致密油形成条件与勘探潜力[J]. 石油勘探与开发, 2012, 39(6):657-667.
	KUANG Lichun, TANG Yong, LEI Dewen, et al. Formation conditions and exploration potential of tight oil in the Permian saline lacustrine dolomitic rock,Junggar basin[J]. Petroleum Exploration and Development, 2012, 39(6):657-667.
[9]	雷德文, 陈刚强, 刘海磊, 等. 准噶尔盆地玛湖凹陷大油(气)区形成条件与勘探方向研究[J]. 地质学报, 2017, 91(7):1604- 1 619.
	LEI Dewen, CHEN Gangqiang, LIU Hailei, et al. Study on foiming conditions and exploration fields of the Mahu giant oil(gas)province,Junggar basin[J]. Acta Geologica Sinica, 2017, 91(7):1604- 1 619.
[10]	何登发, 吴松涛, 赵龙, 等. 环玛湖凹陷二叠—三叠系沉积构造背景及其演化[J]. 新疆石油地质, 2018, 39(1):35-47.
	HE Dengfa, WU Songtao, ZHAO Long, et al. Tectono- depositional setting and its evolution during Permian to Triassic around Mahu sag,Junggar basin[J]. Xinjiang Petroleum Geology, 2018, 39(1):35-47.
[11]	王小军, 杨智峰, 郭旭光, 等. 准噶尔盆地吉木萨尔凹陷页岩油勘探实践与展望[J]. 新疆石油地质, 2019, 40(4):402-413.
	WANG Xiaojun, YANG Zhifeng, GUO Xuguang, et al. Practices and prospects of shale oil exploration in Jimsar sag of Junggar basin[J]. Xinjiang Petroleum Geology, 2019, 40(4):402-413.
[12]	霍进, 支东明, 郑孟林, 等. 准噶尔盆地吉木萨尔凹陷芦草沟组页岩油藏特征与形成主控因素[J]. 石油实验地质, 2020, 42(4):506-513.
	HUO Jin, ZHI Dongming, ZHENG Menglin, et al. Characteristics and main controls of shale oil reservoirs in Lucaogou formation,Jimsar sag,Junggar basin[J]. Petroleum Geology & Experiment, 2020, 42(4):506-513.
[13]	支东明, 宋永, 何文军, 等. 准噶尔盆地中—下二叠统页岩油地质特征-资源潜力及勘探方向[J]. 新疆石油地质, 2019, 40(4):389-401.
	ZHI Dongming, SONG Yong, HE Wenjun, et al. Geological characteristics,resource potential and exploration direction of shale oil in Middle-Lower Permian,Junggar basin[J]. Xinjiang Petroleum Geology, 2019, 40(4):389-401.
[14]	支东明, 唐勇, 杨智峰, 等. 准噶尔盆地吉木萨尔凹陷陆相页岩油地质特征与聚集机理[J]. 石油与天然气地质, 2019, 40(3):524-534.
	ZHI Dongming, TANG Yong, YANG Zhifeng, et al. Geological characteristics and accumulation mechanism of continental shale oil in Jimusaer sag,Junggar basin[J]. Oil & Gas Geology, 2019, 40(3):524-534.
[15]	支东明, 唐勇, 何文军, 等. 准噶尔盆地玛湖凹陷风城组常规-非常规油气有序共生与全油气系统成藏模式[J]. 石油勘探与开发, 2021, 48(1):38-51.
	ZHI Dongming, TANG Yong, HE Wenjun, et al. Orderly coexistence and accumulation models of conventional and unconventional hydrocarbons in Lower Permian Fengcheng formation,Mahu sag,Junggar basin[J]. Petroleum Exploration and Development, 2021, 48(1):38-51.
[16]	张志杰, 袁选俊, 汪梦诗, 等. 准噶尔盆地玛湖凹陷二叠系风城组碱湖沉积特征与古环境演化[J]. 石油勘探与开发, 2018, 45(6):972-984.
	ZHANG Zhijie, YUAN Xuanjun, WANG Mengshi, et al. Alkaline- lacustrine deposition and paleoenvironmental evolution in Permian Fengcheng formation at the Mahu sag,Junggar basin,NW China[J]. Petroleum Exploration and Development, 2018, 45(6):972- 984.
[17]	唐勇, 郑孟林, 王霞田, 等. 准噶尔盆地玛湖凹陷风城组烃源岩沉积古环境[J]. 天然气地球科学, 2022, 33(5):677-692.
	TANG Yong, ZHENG Menglin, WANG Xiatian, et al. Sedimentary paleoenvironment of source rocks of Fengcheng formation in Mahu sag,Junggar basin[J]. Natural Gas Geoscience, 2022, 33(5):677-692.
[18]	宋永, 杨智峰, 何文军, 等. 准噶尔盆地玛湖凹陷二叠系风城组碱湖型页岩油勘探进展[J]. 中国石油勘探, 2022, 27(1):60-72.
	SONG Yong, YANG Zhifeng, HE Wenjun, et al. Exploration progress of alkaline lake type shale oil of the Permian Fengcheng formation in Mahu sag,Junggar basin[J]. China Petroleum Exploration, 2022, 27(1):60-72.
[19]	BERNER R A. Burial of organic carbon and pyrite sulfur in the modern ocean:its geochemical and environmental significance[J]. American Journal of Science, 1982, 282(4):451-473. doi: 10.2475/ajs.282.4.451
[20]	BERNER R A, RAISWELL R. Burial of organic carbon and pyrite sulfur in sediments over phanerozoic time:a new theory[J]. Geochimica et Cosmochimica Acta, 1983, 47(5):855-862. doi: 10.1016/0016-7037(83)90151-5
[21]	BERNER R. Sedimentary pyrite formation:an update[J]. Geochimica et Cosmochimica Acta, 1984, 48:605-615. doi: 10.1016/0016-7037(84)90089-9
[22]	BERNER R A, RAISWELL R. C/S method for distinguishing freshwater from marine sedimentary rocks[J]. Geology, 1984, 12(6):365. doi: 10.1130/0091-7613(1984)12<365:CMFDFF>2.0.CO;2
[23]	LIU Quanyou, LI Peng, JIN Zhijun, et al. Preservation of organic matter in shale linked to bacterial sulfate reduction(BSR) and volcanic activity under marine and lacustrine depositional environments[J]. Marine and Petroleum Geology, 2021, 127:104950. doi: 10.1016/j.marpetgeo.2021.104950
[24]	刘全有, 李鹏, 金之钧, 等. 湖相泥页岩层系富有机质形成与烃类富集:以长7为例[J]. 中国科学:地球科学, 2022, 52(2):270-290.
	LIU Quanyou, LI Peng, JIN Zhijun, et al. Organic-rich formation and hydrocarbon enrichment of lacustrine shale strata:a case study of Chang 7 member[J]. Science China:Earth Sciences, 2022, 52(2):270-290.
[25]	何衍鑫, 鲜本忠, 牛花朋, 等. 古地理环境对火山喷发样式的影响:以准噶尔盆地玛湖凹陷东部下二叠统风城组为例[J]. 古地理学报, 2018, 20(2):245-262.
	HE Yanxin, XIAN Benzhong, NIU Huapeng, et al. Effects of palaeogeographic environment on volcano eruption style:example from the Lower Permian Fengcheng formation in eastern Mahu sag,Junggar basin[J]. Journal of Palaeogeography, 2018, 20(2):245-262.
[26]	WANG Xiaojun, GAO Jiahong, ZHONG Liang, et al. The volcanic impacts on the formation of organic- rich shales from the freshwater to saline lakes:cases study in the Ordos and the Junggar basins[J]. Frontiers in Earth Science, 2022, 10:918391. doi: 10.3389/feart.2022.918391
[27]	何文军, 钱永新, 赵毅, 等. 玛湖凹陷风城组全油气系统勘探启示[J]. 新疆石油地质, 2021, 42(6):641-655.
	HE Wenjun, QIAN Yongxin, ZHAO Yi, et al. Exploration implications of total petroleum system in Fengcheng formation,Mahu sag,Junggar basin[J]. Xinjiang Petroleum Geology, 2021, 42(6):641-655.
[28]	支东明, 曹剑, 向宝力, 等. 玛湖凹陷风城组碱湖烃源岩生烃机理及资源量新认识[J]. 新疆石油地质, 2016, 37(5):499-506.
	ZHI Dongming, CAO Jian, XIANG Baoli, et al. Fengcheng alkaline lacustrine source rocks of Lower Permian in Mahu sag in Junggar basin:hydrocarbon generation mechanism and petroleum resources reestimation[J]. Xinjiang Petroleum Geology, 2016, 37(5):499-506.
[29]	唐勇, 曹剑, 何文军, 等. 从玛湖大油区发现看全油气系统地质理论发展趋势[J]. 新疆石油地质, 2021, 42(1):1-9.
	TANG Yong, CAO Jian, HE Wenjun, et al. Development tendency of geological theory of total petroleum system: insights from the discovery of Mahu large oil province[J]. Xinjiang Petroloeum Geology, 2021, 42(1):1-9.
[30]	杨智峰, 唐勇, 郭旭光, 等. 准噶尔盆地玛湖凹陷二叠系风城组页岩油赋存特征与影响因素[J]. 石油实验地质, 2021, 43(5):784-796.
	YANG Zhifeng, TANG Yong, GUO Xuguang, et al. Occurrence states and potential influencing factors of shale oil in the Permian Fengcheng formation of Mahu sag,Junggar basin[J]. Petroleum Geology & Experiment, 2021, 43(5):784-796.
[31]	钱永新, 邹阳, 赵辛楣, 等. 准噶尔盆地玛湖凹陷玛页1井二叠系风城组全井段岩心剖析与油气地质意义[J]. 油气藏评价与开发, 2022, 12(1):204-214.
	QIAN Yongxin, ZOU Yang, ZHAO Xinmei, et al. Full core analysis and petroleum geological significance of Permian Fengcheng formation in Well MY1,Mahu sag[J]. Reservoir Evaluation and Development, 2022, 12(1):204-214.
[32]	雷海艳, 郭佩, 孟颖, 等. 玛湖凹陷二叠系风城组页岩油储层孔隙结构及分类评价[J]. 岩性油气藏, 2022, 34(3):142-153.
	LEI Haiyan, GUO Pei, MENG Ying, et al. Pore structure and classification evaluation of shale oil reservoirs of Permian Fengcheng formation in Mahu sag[J]. Lithologic Reservoirs, 2022, 34(3):142-153.