川东南二叠系龙潭组海-陆过渡相页岩气甜点评价及意义

doi:10.11743/ogg20230319

Abstract

Abstract:

The marine-continental transitional deposits of Permian Longtan Formation in southeastern Sichuan Basin have been targeted for shale gas but without any significant success. By resorting to analyses on petrology， organic geochemistry， and geology as well as the results of X-ray diffraction， organic petrology analysis， argon ion milling scanning electron microscopy observation， helium porosity testing， and joint measurement， the organic geochemical characteristics， reservoir characteristics， gas-bearing property and their vertical variations of 9 clay mineral-rich（42.69 % on average） layers in the Longtan Formation from some key wells （including Well S1） in southeastern Sichuan Basin were studied to locate potential shale gas enrichment intervals. The results show that the marine-continental transitional shale deposits in the Longtan Formation are thick （the cumulative thickness of shale with TOC>2 % is 50.11 m） and mainly composed of coal seams， carbonaceous shale， shales， silty mudstone， calcareous mudstones and argillaceous limest one. Their average TOC is 4.63 % and average porosity is greater than 2.0 %， both showing a decreasing trend from coal seam， shale， silty mudstone to calcareous mudstones. The organic matter is mainly of type Ⅲ， with an average R_o of 2.07 %. Reservoirs are dominated by clay mineral pores and micro fractures. The combinations of coal with organic-rich shale within layers ② to ④， ⑥ and ⑧ characterized by large thickness， high organic matter abundance， high porosity and gas-bearing property are deemed as potential exploration targets for making shale gas discoveries.

Key words: shale, ogranic geochemistry, marine-continental transitional facies, shale gas, Longtan Formation, Permian, southeastern Sichuan Basin

CLC Number:

TE122.1

Dongjun FENG. Sweet spot assessment and its significance for the marine-continental transitional shale gas of Permian Longtan Fm. in southeastern Sichuan Basin[J]. Oil & Gas Geology, 2023, 44(3): 778-788.

Figures/Tables 12

Fig.1

Fig. 2

Fig. 3

Fig. 4

Table 1

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Fig. 10

Table 2

References 34

1	郭旭升，胡东风，刘若冰，等. 四川盆地二叠系海陆过渡相页岩气地质条件及勘探潜力［J］. 天然气工业， 2018， 38（10）： 11-18.
	GUO Xusheng， HU Dongfeng， LIU Ruobing， et al. Geological conditions and exploration potential of Permian marine-continent transitional facies shale gas in the Sichuan Basin［J］. Natural Gas Industry， 2018， 38（10）： 11-18.
2	邹才能，赵群，丛连铸，等. 中国页岩气开发进展、潜力及前景［J］. 天然气工业， 2021， 41（1）： 1-14.
	ZOU Caineng， ZHAO Qun， CONG Lianzhu， et al. Development progress， potential and prospect of shale gas in China［J］. Natural Gas Industry， 2021， 41（1）： 1-14.
3	董大忠，邱振，张磊夫，等. 海陆过渡相页岩气层系沉积研究进展与页岩气新发现［J］. 沉积学报， 2021， 39（1）： 29-45.
	DONG Dazhong， QIU Zhen， ZHANG Leifu， et al. Progress on sedimentology of transitional facies shales and new discoveries of shale gas［J］. Acta Sedimentologica Sinica， 2021， 39（1）： 29-45.
4	匡立春，董大忠，何文渊，等. 鄂尔多斯盆地东缘海陆过渡相页岩气地质特征及勘探开发前景［J］. 石油勘探与开发， 2020， 47（3）： 435-446.
	KUANG Lichun， DONG Dazhong， HE Wenyuan， et al. Geological characteristics and development potential of transitional shale gas in the east margin of the Ordos Basin， NW China［J］. Petroleum Exploration and Development， 2020， 47（3）： 435-446.
5	聂海宽，何治亮，刘光祥，等. 中国页岩气勘探开发现状与优选方向［J］. 中国矿业大学学报， 2020， 49（1）： 13-35.
	NIE Haikuan， HE Zhiliang， LIU Guangxiang， et al. Status and direction of shale gas exploration and development in China［J］. Journal of China University of Mining & Technology， 2020， 49（1）： 13-35.
6	何治亮，聂海宽，李双建，等. 特提斯域板块构造约束下上扬子地区二叠系龙潭组页岩气的差异性赋存［J］. 石油与天然气地质， 2021， 42（1）： 1-15.
	HE Zhiliang， NIE Haikuan， LI Shuangjian， et al. Differential occurrence of shale gas in the Permian Longtan Formation of Upper Yangtze region constrained by plate tectonics in the Tethyan domain［J］. Oil & Gas Geology， 2021， 42（1）： 1-15.
7	何燚，唐玄，单衍胜，等. 四川盆地及其周缘典型地区龙潭组页岩岩相划分对比及特征［J］. 天然气地球科学， 2021， 32（2）： 174-190.
	HE Yi， TANG Xuan， SHAN Yansheng， et al. Lithofacies division and comparison and characteristics of Longtan Formation shale in typical areas of Sichuan Basin and its surrounding［J］. Natural Gas Geoscience， 2021， 32（2）： 174-190.
8	曹涛涛，曹清古，刘虎，等. 川东地区海陆过渡相泥页岩地球化学特征及吸附性能［J］. 煤炭学报， 2020， 45（4）： 1445-1456.
	CAO Taotao， CAO Qinggu， LIU Hu， et al. Geochemical characteristics and adsorption capacity of marine-continental transitional mudrock in eastern Sichuan Basin［J］. Journal of China Coal Society， 2020， 45（4）： 1445-1456.
9	王鹏威，刘光祥，刘忠宝，等. 川东南—黔西北地区上二叠统龙潭组海陆过渡相页岩气富集条件及主控因素［J］. 天然气地球科学， 2022， 33（3）： 431-440.
	WANG Pengwei， LIU Guangxiang， LIU Zhongbao， et al. Shale gas enrichment conditions and controlling factors of Upper Permian Longtan Formation transitional shale in Southeast Sichuan to Northwest Guizhou［J］. Natural Gas Geoscience， 2022， 33（3）： 431-440.
10	刘光祥，金之钧，邓模，等. 川东地区上二叠统龙潭组页岩气勘探潜力［J］. 石油与天然气地质， 2015， 36（3）： 481-487.
	LIU Guangxiang， JIN Zhijun， DENG Mo， et al. Exploration potential for shale gas in the Upper Permian Longtan Formation in eastern Sichuan Basin［J］. Oil & Gas Geology， 2015， 36（3）： 481-487.
11	李进，王学军，周凯，等. 海陆过渡相超深层页岩储层特征——以川东北普光气田Y4井上二叠统龙潭组下段为例［J］. 石油实验地质， 2022， 44（1）： 71-84.
	LI Jin， WANG Xuejun， ZHOU Kai， et al. Characteristics of ultra-deep shale reservoir of marine-continental transitional facies： a case study of lower member of Upper Permian Longtan Formation in well Y4， Puguang Gas Field， northeastern Sichuan Basin［J］. Petroleum Geology & Experiment， 2022， 44（1）： 71-84.
12	庞艳荣，胡忠贵，胡明毅，等. 四川盆地涪陵地区上二叠统长兴组沉积特征及有利储集区带［J］. 大庆石油地质与开发， 2022， 41（4）： 20-30.
	PANG Yanrong， HU Zhonggui， HU Mingyi， et al. Sedimentary characteristics and favorable reservoir plays in Upper Permian Changxing Formation in Fuling area in Sichuan Basin［J］. Petroleum Geology & Oilfield Development in Daqing， 2022， 41（4）： 20-30.
13	史淼，张金川，袁野，等. 上扬子黔西北地区海相与海陆过渡相页岩气储层孔隙特征差异性研究［J］. 特种油气藏， 2022， 29（3）： 9-17.
	SHI Miao， ZHANG Jinchuan， YUAN Ye， et al. Study on the difference of pore characteristics between marine and marine-continental transitional shale gas reservoirs in Upper Northwest Guizhou［J］. Special Oil & Gas Reservoirs， 2022， 29（3）： 9-17.
14	周小进. 中国南方二叠纪构造—层序岩相古地理［D］. 长沙：中南大学， 2009： 26-28.
	ZHOU Xiaojin. Tectonic-sequence-based lithofacies and paleogeography of Permian in south of China［D］. Changsha： Central South University， 2009： 26-28.
15	金之钧，胡宗全，高波，等. 川东南地区五峰组-龙马溪组页岩气富集与高产控制因素［J］. 地学前缘， 2016， 23（1）： 1-10.
	JIN Zhijun， HU Zongquan， GAO Bo， et al. Controlling factors on the enrichment and high productivity of shale gas in the Wufeng-Longmaxi formations， southeastern Sichuan Basin［J］. Earth Science Frontiers， 2016， 23（1）： 1-10.
16	赵杏媛，何东博. 黏土矿物与页岩气［J］. 新疆石油地质， 2012， 33（6）： 643-647.
	ZHAO Xingyuan， HE Dongbo. Clay minerals and shale gas［J］. Xinjiang Petroleum Geology， 2012， 33（6）： 643-647.
17	李鑫羽，欧阳传湘，杨博文，等. 基于BP神经网络的黏土矿物预测模型［J］. 新疆石油地质， 2021， 42（5）： 624-629.
	LI Xinyu， OUYANG Chuanxiang， YANG Bowen， et al. BP Neural Network-Based Models to Predict Clay Minerals［J］. Xinjiang Petroleum Geology， 2021， 42（5）： 624-629.
18	高凤琳，王成锡，宋岩，等. 氩离子抛光—场发射扫描电镜分析方法在识别有机显微组分中的应用［J］. 石油实验地质， 2021， 43（2）： 360-367.
	GAO Fenglin， WANG Chengxi， SONG Yan， et al. Ar-ion polishing FE-SEM analysis of organic maceral identification［J］. Petroleum Geology and Experiment， 2021， 43（2）： 360-367.
19	王鹏威，张亚雄，刘忠宝，等. 四川盆地东部涪陵地区自流井组陆相页岩储层微裂缝发育特征及其对页岩气富集的意义［J］. 天然气地球科学， 2021， 32（11）： 1724-1734.
	WANG Pengwei， ZHANG Yaxiong， LIU Zhongbao， et al. Microfracture development at Ziliujing lacustrine shale reservoir and its significance for shale-gas enrichment at Fuling area in eastern Sichuan Basin［J］. Natural Gas Geoscience， 2021， 32（11）： 1724-1734.
20	曹涛涛，刘光祥，曹清古，等. 有机显微组成对泥页岩有机孔发育的影响——以川东地区海陆过渡相龙潭组泥页岩为例［J］. 石油与天然气地质， 2018， 39（1）： 40-53.
	CAO Taotao， LIU Guangxiang， CAO Qinggu， et al. Influence of maceral composition on organic pore development in shale： A case study of transitional Longtan Formation shale in eastern Sichuan Basin［J］. Oil & Gas Geology， 2018， 39（1）： 40-53.
21	KO L T， LOUCKS R G， ZHANG Tongwei， et al. Pore and pore network evolution of Upper Cretaceous Boquillas （Eagle Ford-equivalent） mudrocks： Results from gold tube pyrolysis experiments［J］. AAPG Bulletin， 2016， 100（11）： 1693-1722.
22	刘忠宝，胡宗全，刘光祥，等. 四川盆地东北部下侏罗统自流井组陆相页岩储层孔隙特征及形成控制因素［J］. 石油与天然气地质， 2021， 42（1）： 136-145.
	LIU Zhongbao， HU Zongquan， LIU Guangxiang， et al. Pore characteristics and controlling factors of continental shale reservoirs in the Lower Jurassic Ziliujing Formation， northeastern Sichuan Basin［J］. Oil & Gas Geology， 2021， 42（1）： 136-145.
23	JI Liming， ZHANG Tongwei， MILLIKEN K L， et al. Experimental investigation of main controls to methane adsorption in clay-rich rocks［J］. Applied Geochemistry， 2012， 27（12）： 2533-2545.
24	ROSS D J K， BUSTIN R M. The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs［J］. Marine and Petroleum Geology， 2009， 26（6）： 916-927.
25	李军，武清钊，路菁，等. 页岩气储层总孔隙度与有效孔隙度测量及测井评价——以四川盆地龙马溪组页岩气储层为例［J］. 石油与天然气地质， 2017， 38（3）： 602-609.
	LI Jun， WU Qingzhao， LU Jing， et al. Measurement and logging evaluation of total porosity and effective porosity of shale gas reservoirs： A case from the Silurian Longmaxi Formation shale in the Sichuan Basin［J］. Oil & Gas Geology， 2017， 38（3）： 602-609.
26	LU Jiemin， RUPPEL S C， ROWE H D. Organic matter pores and oil generation in the Tuscaloosa marine shale［J］. AAPG Bulletin， 2015， 99（2）： 333-357.
27	王鹏威，陈筱，刘忠宝，等. 海相富有机质页岩储层压力预测方法——以涪陵页岩气田上奥陶统五峰组-下志留统龙马溪组页岩为例［J］. 石油与天然气地质， 2022， 43（2）： 467-476.
	WANG Pengwei， CHEN Xiao， LIU Zhongbao， et al. Reservoir pressure prediction for marine organic-rich shale： A case study of the Upper Ordovician Wufeng-Lower Silurian Longmaxi shale in Fuling shale gas field， NE Sichuan Basin［J］. Oil & Gas Geology， 2022， 43（2）： 467-476.
28	任俊豪，任晓海，宋海强，等. 基于分子模拟的纳米孔内甲烷吸附与扩散特征［J］. 石油学报， 2020， 41（11）： 1366-1375.
	REN Junhao， REN Xiaohai， SONG Haiqiang， et al. Adsorption and diffusion characteristics of methane in nanopores based on molecular simulation［J］. Acta Petrolei Sinica， 2020， 41（11）： 1366-1375.
29	CHALMERS G R， BUSTIN M R. The effects and distribution of moisture in gas shale reservoir systems［C］//AAPG Annual Convention and Exhibition. New Orleans： AAPG， 2010： 90104.
30	YANG Rui， JIA Aoqi， HE Sheng， et al. Water adsorption characteristics of organic-rich Wufeng and Longmaxi Shales， Sichuan Basin （China）［J］. Journal of Petroleum Science and Engineering， 2020， 193： 107387.
31	吴蒙，秦勇，申建，等. 致密砂岩储层束缚水饱和度影响因素：以鄂尔多斯盆地临兴地区为例［J］. 吉林大学学报（地球科学版）， 2022， 52（1）： 68-79.
	WU Meng， QIN Yong， SHEN Jian， et al. Influencing Factors of Irreducible Water Saturation in Tight Sandstone Reservoirs： A Case Study of Linxing Area in Ordos Basin［J］. Journal of Jilin University （Earth Science Edition）， 2022， 52（1）： 68-79.
32	王鹏威，刘忠宝，李雄，等. 川东红星地区上二叠统吴家坪组页岩发育特征及其页岩气富集意义［J］. 石油与天然气地质， 2022， 43（5）： 1102-1114.
	WANG Pengwei， LIU Zhongbao， LI Xiong， et al. Development of the Upper Permian Wujiaping shale in Hongxing area， eastern Sichuan Basin， and its significance to shale gas enrichment［J］. Oil & Gas Geology， 2022， 43（5）： 1102-1114.
33	肖威，张兵，姚永君，等. 川东二叠系龙潭组页岩岩相特征与沉积环境［J］. 岩性油气藏， 2022， 34（2）： 152-162.
	XIAO Wei， ZHANG Bing， YAO Yongjun， et al. Lithofacies and sedimentary environment of shale of Permian Longtan Formation in eastern Sichuan Basin［J］. Lithologic Reservoirs， 2022， 34（2）： 152-162.
34	何文渊，云建兵，钟建华. 川东北二叠系长兴组碳酸盐岩云化成储机制［J］. 岩性油气藏， 2022， 34（5）： 1-25.
	HE Wenyuan， YUN Jianbing， ZHONG Jianhua. Reservoir-forming mechanism of carbonate dolomitization of Permian Chang-xing Formation in northeastern Sichuan Basin［J］. Lithologic Reservoirs， 2022， 34（5）： 1-25.

深度/m	岩性	R_o/%	测点数/个
3 095.98	黑色页岩	1.86	32
3 109.72	黑灰色页岩	1.93	23
3 114.20	黑色炭质页岩	1.99	40
3 130.21	煤层	2.08	29
3 143.55	灰黑色页岩	2.09	32
3 166.90	黑灰色泥岩	2.13	20
3 169.95	灰黑色炭质页岩	2.16	30
3 178.38	煤层	2.20	31
3 179.52	黑色炭质页岩	2.21	32

层系	井名	沉积亚相	TOC/%	干酪根类型	R_o/%	孔隙度/%	孔隙类型	脆性矿物含量/%	黏土矿物含量/%
二叠系龙潭组	S1	潮坪-潟湖	3.84	Ⅲ-Ⅱ₂	2.07	8.41	黏土矿物层间孔为主，可见有机质孔	44.80	55.20
五峰组-龙马溪组	JY1	深水陆棚	3.52	Ⅱ₁	2.00～2.50	4.81	有机质孔为主，可见脆性矿物孔	62.40	34.60
侏罗系自流井组东岳庙段	FY10	半深湖-深湖	1.37	Ⅲ-Ⅱ₂	1.56	4.15	黏土矿物层间孔为主，可见有机质孔	43.82	56.18

[1]	Huimin LIU, Youshu BAO, Maowen LI, Zheng LI, Lianbo WU, Rifang ZHU, Dayang WANG, Xin WANG. Geochemical parameters for evaluating shale oil enrichment and mobility： A case study of shales in the Bakken Formation， Williston Basin and the Shahejie Formation， Jiyang Depression [J]. Oil & Gas Geology, 2024, 45(3): 622-636.
[2]	Xiugang PU, Jiangchang DONG, Gongquan CHAI, Shunyao SONG, Zhannan SHI, Wenzhong HAN, Wei ZHANG, Delu XIE. Enrichment model of high-abundance organic matter in shales in the 2^nd member of the Paleogene Kongdian Formation， Cangdong Sag， Bohai Bay Basin [J]. Oil & Gas Geology, 2024, 45(3): 696-709.
[3]	Rui FANG, Yuqiang JIANG, Changcheng YANG, Haibo DENG, Chan JIANG, Haitao HONG, Song TANG, Yifan GU, Xun ZHU, Shasha SUN, Guangyin CAI. Occurrence states and mobility of shale oil in different lithologic assemblages in the Jurassic Lianggaoshan Formation， Sichuan Basin [J]. Oil & Gas Geology, 2024, 45(3): 752-769.
[4]	Jun LI, Youlong ZOU, Jing LU. Well-log-based assessment of movable oil content in lacustrine shale oil reservoirs： A case study of the 2^nd member of the Paleogene Funing Formation， Subei Basin [J]. Oil & Gas Geology, 2024, 45(3): 816-826.
[5]	Xiaoyu DU, Zhijun JIN, Lianbo ZENG, Guoping LIU, Sen YANG, Xinping LIANG, Guoqing LU. Evaluation of natural fracture effectiveness in deep lacustrine shale oil reservoirs based on formation microresistivity imaging logs [J]. Oil & Gas Geology, 2024, 45(3): 852-865.
[6]	Caineng ZOU, Dazhong DONG, Wei XIONG, Guoyou FU, Qun ZHAO, Wen LIU, Weiliang KONG, Qin ZHANG, Guangyin CAI, Yuman WANG, Feng LIANG, Hanlin LIU, Zhen QIU. Advances， challenges， and countermeasures in shale gas exploration of underexplored plays， sequences and new types in China [J]. Oil & Gas Geology, 2024, 45(2): 309-326.
[7]	Zhe ZHAO, Bin BAI, Chang LIU, Lan WANG, Haiyan ZHOU, Yuxi LIU. Current status， advances， and prospects of CNPC’s exploration of onshore moderately to highly mature shale oil reservoirs [J]. Oil & Gas Geology, 2024, 45(2): 327-340.
[8]	Bo LIU, Qi’an MENG, Xiaofei FU, Tiefeng LIN, Yunfeng BAI, Shansi TIAN, Jinyou ZHANG, Yao YAO, Xinyang CHENG, Zhao LIU. Composition of generated and expelled hydrocarbons and phase evolution of shale oil in the 1^st member of Qingshankou Formation， Songliao Basin [J]. Oil & Gas Geology, 2024, 45(2): 406-419.
[9]	Xiao HE, Maja ZHENG, Yong LIU, Qun ZHAO, Xuewen Shi, Zhenxue Jiang, Wei WU, Ya WU, Shitan NING, Xianglu TANG, Dadong LIU. Characteristics and differential origin of Qiongzhusi Formation shale reservoirs under the “aulacogen-uplift” tectonic setting， Sichuan Basin [J]. Oil & Gas Geology, 2024, 45(2): 420-439.
[10]	Changbo ZHAI, Liangbiao LIN, Donghua YOU, Fengbin LIU, Siyu LIU. Sedimentary microfacies characteristics and organic matter enrichment pattern of the 1^st member of the Middle Permian Maokou Formation， southwestern Sichuan Basin [J]. Oil & Gas Geology, 2024, 45(2): 440-456.
[11]	Hequn GAO, Yuqiao GAO, Xipeng HE, Jun NIE. Rock mechanical properties and controlling factors for shale oil reservoirs in the second member of the Paleogene Funing Formation， Subei Basin [J]. Oil & Gas Geology, 2024, 45(2): 502-515.
[12]	Liang SHI, Bojiang FAN, Zhonghou LI, Ziwei YU, Zijin LIN, Xinyang DAI. Migration differentiation of hydrocarbon components in the 7^th member of the Triassic Yanchang Formation， central Ordos Basin [J]. Oil & Gas Geology, 2024, 45(1): 157-168.
[13]	Jiangjun CAO, Jiping WANG, Daofeng ZHANG, Long WANG, Xiaotian LI, Ya LI, Yuanyuan ZHANG, Hui XIA, Zhanhai YU. Effects of diagenetic evolution on gas-bearing properties of deep tight sandstone reservoirs： A case study of reservoirs in the 1^st member of the Permian Shanxi Formation in the Qingyang gas field， southwestern Ordos Basin [J]. Oil & Gas Geology, 2024, 45(1): 169-184.
[14]	Yi ZHANG, Bin ZHANG, Banghua LIU, Jie LIU, Qiansheng WEI, Qi ZHANG, Hongjun LU, Pengyu ZHU, Rui WANG. Status quo and development trends of research on shale gas adsorption and seepage in shale gas reservoirs [J]. Oil & Gas Geology, 2024, 45(1): 256-280.
[15]	Xusheng GUO, Xiaoxiao MA, Maowen LI, Menhui QIAN, Zongquan HU. Mechanisms for lacustrine shale oil enrichment in Chinese sedimentary basins [J]. Oil & Gas Geology, 2023, 44(6): 1333-1349.

Sweet spot assessment and its significance for the marine-continental transitional shale gas of Permian Longtan Fm. in southeastern Sichuan Basin

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 12

References 34

Related Articles 15

Recommended Articles

Metrics