Shale Gas Accumulation Characteristics of Wufeng Formation-Longmaxi Formation in Luzhou Area

doi:10.7657/XJPG20240103

Abstract

Abstract:

To find favorable areas for shale gas accumulation in the Wufeng formation-Longmaxi formation in the Luzhou area of the Sichuan basin，fluid inclusion detection，shale micropore observation，and gas bubble-pore evolution simulation were performed. On this basis，the tectonic burial process and the hydrocarbon generation and thermal evolution process in the Luzhou area were investigated，and the characteristics and patterns of shale gas accumulation in the Luzhou area were summarized. The results show that the Wufeng formation-Longmaxi formation in the Luzhou area has a set of thick organic-rich shales. During the Permian to Early Triassic，oil was generated from the shale which then experienced two tectonic uplift events during the Middle Triassic and the Yanshanian-Himalayan movement. The gentle uplifting of the formation in the Middle Triassic did not induce extensive hydrocarbon loss，while the uplifting during the Yanshanian-Himalayan movement was later than that of the structure in the southeastern part of Sichuan basin，with a small magnitude，which was favorable for shale gas preservation. The organic pores in the shales were developed as a result of the fact that the uplifting with short duration and low intensity in the Middle Triassic did not cause massive hydrocarbon expulsion，leaving a large quantity of liquid hydrocarbons in the reservoirs and allowing well preservation of organic pores during the Late Triassic to Middle Cretaceous，when liquid hydrocarbons were cracked to gas along with deep burial，and the strata were universally under overpressure. Although the Triassic uplifting in the Luzhou area was short-lived and of low intensity，the simulation results suggest that it led to crude oil thickening and gas pore formation，which was beneficial for shale gas accumulation. The uplifting in the Indosinian period resulted in crude oil thickening，facilitating shale gas accumulation. The late strata uplifting together with a short period of shale gas loss，developed low-angle bedding fractures，and fewer vertical fractures all contribute to the formation of overpressured shale gas accumulation zones in the Luzhou area. The proposed patterns of shale gas accumulation in the Wufeng formation-Longmaxi formation in the Luzhou area are of great reference significance in guiding oil and gas exploration for similar reservoirs.

Key words: Sichuan basin, Luzhou area, Wufeng formation, Longmaxi formation, shale reservoir, shale gas, pore origin, uplift, hydrocarbon accumulation

CLC Number:

TE122

LIU Honglin, WANG Huaichang, LI Xiaobo. Shale Gas Accumulation Characteristics of Wufeng Formation-Longmaxi Formation in Luzhou Area[J]. Xinjiang Petroleum Geology, 2024, 45(1): 19-26.

Figures/Tables 7

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Fig. 6.

Fig. 7.

References 32

[1]	马新华. 四川盆地南部页岩气富集规律与规模有效开发探索[J]. 天然气工业, 2018, 38(10):1-10.
	MA Xinhua. Enrichment laws and scale effective development of shale gas in the southern Sichuan basin[J]. Natural Gas Industry, 2018, 38(10):1-10.
[2]	马新华. 天然气与能源革命:以川渝地区为例[J]. 天然气工业, 2017, 37(1):1-8.
	MA Xinhua. Natural gas and energy revolution:A case study of Sichuan-Chongqing gas province[J]. Natural Gas Industry, 2017, 37(1):1-8.
[3]	马新华. 四川盆地天然气发展进入黄金时代[J]. 天然气工业, 2017, 37(2):1-10.
	MA Xinhua. A golden era for natural gas development in the Sichuan basin[J]. Natural Gas Industry, 2017, 37(2):1-10.
[4]	郎岳, 张金川, 王焕第, 等. 页岩气地质评价智能化的应用与展望[J]. 大庆石油地质与开发, 2022, 41(1):166-174.
	LANG Yue, ZHANG Jinchuan, WANG Huandi, et al. Application and prospect of intelligent geological evaluation of shale gas[J]. Petroleum Geology & Oilfield Development in Daqing, 2022, 41(1):166-174.
[5]	何骁, 周鹏, 杨洪志, 等. 页岩气地质工程一体化管理实践与展望[J]. 天然气工业, 2022, 42(2):1-10.
	HE Xiao, ZHOU Peng, YANG Hongzhi, et al. Management practice and prospect of shale gas geology-engineering integration[J]. Natural Gas Industry, 2022, 42(2):1-10.
[6]	杨振恒, 陶国亮, 鲍云杰, 等. 南方海相深层页岩气储集空间差异化发育及保持机理探讨[J]. 石油实验地质, 2022, 44(5):845-853.
	YANG Zhenheng, TAO Guoliang, BAO Yunjie, et al. Differential development and maintenance mechanism of reservoir space for marine shale gas in south China’s deep strata[J]. Petroleum Geology & Experiment, 2022, 44(5):845-853.
[7]	宋振响, 王保华, 魏祥峰, 等. “存滞系数”法在页岩气资源评价中的应用:以川东南上奥陶统五峰组—下志留统龙马溪组页岩气为例[J]. 石油实验地质, 2022, 44(3):535-544.
	SONG Zhenxiang, WANG Baohua, WEI Xiangfeng, et al. Application of “retention coefficiency” method in shale gas resource evaluation:A case study of Upper Ordovician Wufeng formation to Lower Silurian Longmaxi formation,southeastern Sichuan basin[J]. Petroleum Geology & Experiment, 2022, 44(3):535-544.
[8]	刘伟新, 卢龙飞, 叶德燎, 等. 川东南地区奥陶系五峰组—志留系龙马溪组页岩气异常压力封存箱剖析与形成机制[J]. 石油实验地质, 2022, 44(5):804-814.
	LIU Weixin, LU Longfei, YE Deliao, et al. Significance and formation mechanism of abnormally pressured compartments of shale gas in the Ordovician Wufeng-Silurian Longmaxi formations,southeastern Sichuan basin[J]. Petroleum Geology & Experiment, 2022, 44(5):804-814.
[9]	管全中, 董大忠, 芦慧, 等. 异常高压对四川盆地龙马溪组页岩气藏的影响[J]. 新疆石油地质, 2015, 36(1):55-60.
	GUAN Quanzhong, DONG Dazhong, LU Hui, et al. Influences of abnormal high pressure on Longmaxi shale gas reservoir in Sichuan basin[J]. Xinjiang Petroleum Geology, 2015, 36(1):55-60.
[10]	何治亮, 聂海宽, 蒋廷学. 四川盆地深层页岩气规模有效开发面临的挑战与对策[J]. 油气藏评价与开发, 2021, 11(2):1-11.
	HE Zhiliang, NIE Haikuan, JIANG Tingxue. Challenges and countermeasures of effective development with large scale of deep shale gas in Sichuan basin[J]. Reservoir Evaluation and Development, 2021, 11(2):1-11.
[11]	高健. 四川盆地威远区块页岩气立体开发技术与对策:以威202井区A平台为例[J]. 天然气工业, 2022, 42(2):93-99.
	GAO Jian. Three-dimensional development technologies and countermeasures for shale gas in Weiyuan block of the Sichuan basin:A case study on Wei 202A platform[J]. Natural Gas Industry, 2022, 42(2):93-99.
[12]	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.
[13]	陆亚秋, 梁榜, 王超, 等. 四川盆地涪陵页岩气田江东区块下古生界深层页岩气勘探开发实践与启示[J]. 石油与天然气地质, 2021, 42(1):241-250.
	LU Yaqiu, LIANG Bang, WANG Chao, et al. Shale gas exploration and development in the Lower Paleozoic Jiangdong block of Fuling gas field,Sichuan basin[J]. Oil & Gas Geology, 2021, 42(1):241-250.
[14]	宋毅, 林然, 黄浩勇, 等. 深层页岩气水平井压裂异步起裂裂缝延伸模拟与调控[J]. 大庆石油地质与开发, 2022, 41(5):145-152.
	SONG Yi, LIN Ran, HUANG Haoyong, et al. Simulation and control of fractures asynchronous initiation-propagation of horizontal well fracturing for deep shale gas[J]. Petroleum Geology & Oilfield Development in Daqing, 2022, 41(5):145-152.
[15]	沈骋, 谢军, 赵金洲, 等. 泸州—渝西区块海相页岩可压性演化差异[J]. 中国矿业大学学报, 2020, 49(4):742-754.
	SHEN Cheng, XIE Jun, ZHAO Jinzhou, et al. Evolution difference of fracability of marine shale gas reservoir in Luzhou and west Chongqing block,Sichuan basin[J]. Journal of China University of Mining & Technology, 2020, 49(4):742-754.
[16]	沈骋, 赵金洲, 谢军, 等. 海相页岩缝网可压性靶窗空间分布预测:以川南长宁区块为例[J]. 地质力学学报, 2020, 26(6):881-891.
	SHEN Cheng, ZHAO Jinzhou, XIE Jun, et al. Target window spatial distribution prediction based on network fracability:A case study of shale gas reservoirs in the Changning block,southern Sichuan basin[J]. Journal of Geomechanics, 2020, 26(6):881-891.
[17]	杨洪志, 赵圣贤, 刘勇, 等. 泸州区块深层页岩气富集高产主控因素[J]. 天然气工业, 2019, 39(11):55-63.
	YANG Hongzhi, ZHAO Shengxian, LIU Yong, et al. Main controlling factors of enrichment and high-yield of deep shale gas in the Luzhou block,southern Sichuan basin[J]. Natural Gas Industry, 2019, 39(11):55-63.
[18]	黄涵宇, 何登发, 李英强, 等. 四川盆地东南部泸州古隆起的厘定及其成因机制[J]. 地学前缘, 2019, 26(1):102-120. doi: 10.13745/j.esf.sf.2019.1.9
	HUANG Hanyu, HE Dengfa, LI Yingqiang, et al. Determination and formation mechanism of the Luzhou paleo-uplift in the southeastern Sichuan basin[J]. Earth Science Frontiers, 2019, 26(1):102-120. doi: 10.13745/j.esf.sf.2019.1.9
[19]	马新华, 谢军. 川南地区页岩气勘探开发进展及发展前景[J]. 石油勘探与开发, 2018, 45(1):161-169. doi: 10.11698/PED.2018.01.18
	MA Xinhua, XIE Jun. The progress and prospects of shale gas exploration and exploitation in southern Sichuan basin,NW China[J]. Petroleum Exploration and Development, 2018, 45(1):161-169.
[20]	马新华, 谢军, 雍锐, 等. 四川盆地南部龙马溪组页岩气储集层地质特征及高产控制因素[J]. 石油勘探与开发, 2020, 47(5):841-855. doi: 10.11698/PED.2020.05.01
	MA Xinhua, XIE Jun, YONG Rui, et al. Geological characteristics and high production control factors of shale gas reservoirs in Silurian Longmaxi formation,southern Sichuan basin,SW China[J]. Petroleum Exploration and Development, 2020, 47(5):841-855.
[21]	张光荣, 聂海宽, 唐玄, 等. 基于有机孔和生物成因硅优选页岩气富集高产层段的方法及应用:以四川盆地及其周缘五峰组—龙马溪组页岩为例[J]. 天然气地球科学, 2021, 32(6):888-898.
	ZHANG Guangrong, NIE Haikuan, TANG Xuan, et al. Optimization method and application of shale gas enrichment layer based on biogenic silica and organic matter pore:Case study of Wufeng-Longmaxi formations shale in the Sichuan basin and its periphery[J]. Natural Gas Geoscience, 2021, 32(6):888-898.
[22]	赵圣贤, 杨跃明, 张鉴, 等. 四川盆地下志留统龙马溪组页岩小层划分与储层精细对比[J]. 天然气地球科学, 2016, 27(3):470-487.
	ZHAO Shengxian, YANG Yueming, ZHANG Jian, et al. Micro-layers division and fine reservoirs contrast of Lower Silurian Longmaxi formation shale,Sichuan basin,SW China[J]. Natural Gas Geoscience, 2016, 27(3):470-487.
[23]	HIRSCHBERG A, DE JONG L N J, SCHIPPER B A, et al. Influence of temperature and pressure on asphaltene flocculation[J]. Society of Petroleum Engineers Journal, 1984, 24(3):283-293. doi: 10.2118/11202-PA
[24]	刘洪林, 李晓波, 周尚文. 黑色页岩中发生的气泡变孔作用及地质意义[J]. 天然气与石油, 2018, 36(6):60-64.
	LIU Honglin, LI Xiaobo, ZHOU Shangwen. Phenomenon of bubble evolving into pore occurred in black shale and its geological significance[J]. Natural Gas and Oil, 2018, 36(6):60-64.
[25]	唐令, 宋岩, 姜振学, 等. 渝东南盆缘转换带龙马溪组页岩气散失过程、能力及其主控因素[J]. 天然气工业, 2018, 38(12):37-47.
	TANG Ling, SONG Yan, JIANG Zhenxue, et al. Diffusion process and capacity of Longmaxi shale gas in the basin-margin transition zone of SE Chongqing and their controlling factors[J]. Natural Gas Industry, 2018, 38(12):37-47.
[26]	唐相路, 姜振学, 李卓, 等. 渝东南地区龙马溪组高演化页岩微纳米孔隙非均质性及主控因素[J]. 现代地质, 2016, 30(1):163-171.
	TANG Xianglu, JIANG Zhenxue, LI Zhuo, et al. Micro/nano pore heterogeneity and main controlling factors of the high-maturity Longmaxi formation shale in southeastern Chongqing[J]. Geoscience, 2016, 30(1):163-171.
[27]	苏海琨, 聂海宽, 郭少斌, 等. 深层页岩含气量评价及其差异变化:以四川盆地威荣、永川页岩气田为例[J]. 石油实验地质, 2022, 44(5):815-824.
	SU Haikun, NIE Haikuan, GUO Shaobin, et al. Shale gas content evaluation for deep strata and its variation:A case study of Weirong,Yongchuan gas fields in Sichuan basin[J]. Petroleum Geology & Experiment, 2022, 44(5):815-824.
[28]	吴娟, 陈学忠, 刘文平, 等. 川南五峰组—龙马溪组页岩流体活动及压力演化过程[J]. 地球科学, 2022, 47(2):518-531.
	WU Juan, CHEN Xuezhong, LIU Wenping, et al. Fluid activity and pressure evolution process of Wufeng-Longmaxi shales,southern Sichuan basin[J]. Earth Science, 2022, 47(2):518-531.
[29]	刘洪林, 郭伟, 刘德勋, 等. 海相页岩成岩过程中的自生脆化作用[J]. 天然气工业, 2018, 38(5):17-25.
	LIU Honglin, GUO Wei, LIU Dexun, et al. Authigenic embrittlement of marine shale in the process of diagenesis[J]. Natural Gas Industry, 2018, 38(5):17-25.
[30]	张晨晨, 刘滋, 董大忠, 等. 深层海相页岩脆性特征分析与表征[J]. 新疆石油地质, 2019, 40(5):555-563.
	ZHANG Chenchen, LIU Zi, DONG Dazhong, et al. Brittleness analysis and characterization of deep marine shales[J]. Xinjiang Petroleum Geology, 2019, 40(5):555-563.
[31]	段文刚, 吝文, 田继军, 等. 川南罗布向斜五峰组—龙马溪组页岩孔隙分形特征与主控因素[J]. 新疆石油地质, 2022, 43(2):153-159.
	DUAN Wengang, LIN Wen, TIAN Jijun, et al. Fractal characteristics and main controlling factors of Wufeng-Longmaxi formation shale in Luobu syncline,southern Sichuan basin[J]. Xinjiang Petroleum Geology, 2022, 43(2):153-159.
[32]	甘仁忠, 熊健, 彭妙, 等. 陆相页岩储集层岩石力学特性及能量演化特征[J]. 新疆石油地质, 2023, 44(4):472-478.
	GAN Renzhong, XIONG Jian, PENG Miao, et al. Rock mechanical properties and energy evolution of continental shale reservoirs[J]. Xinjiang Petroloeum Geology, 2023, 44(4):472-478.