四川盆地及周缘志留系龙马溪组一段深层页岩储层特征及其成因

doi:10.11743/ogg20210106

摘要/Abstract

摘要：

深层页岩储层是页岩气勘探开发的重要接替领域。针对四川盆地及周缘龙马溪组一段深层页岩，系统开展了X-衍射全岩（XRD）、总有机碳（TOC）、大薄片及氩离子抛光大片成像研究。结果表明，相对于浅层页岩，深层页岩储层具有高硅质和低TOC含量、低粉砂纹层含量、高孔隙度和更有效的孔隙网络特征。由浅层至深层，页岩硅质含量由30%增至62%。相应地，碳酸盐含量由32%降至14.3%，粘土矿物含量由33%降至7.8%，TOC含量由7.1%降至4.25%。深层页岩储层发育条带状粉砂纹理，与浅层页岩相比，其粉砂纹层含量减少、单层厚度减薄。黑色页岩发育有机孔、无机孔和微裂缝，由浅层至深层，页岩总面孔率由1.6%增至10.8%，有机孔和无机孔均明显增加，且微裂缝占比由1%增至12%。深层页岩储层有机孔、无机孔和微裂缝相互连通，形成有效的孔隙网络。深层高硅质含量、高孔隙度和更有效的孔隙网络与生物成因硅有关，低TOC含量与远离物源有关，低粉砂纹层含量与水深较大有关。生物成因硅在成岩过程中可形成大量有机孔、无机孔和微裂缝，且其可有效保存孔隙。有机质的生成受营养物质供给影响，远离物源区营养供给较少。粉砂纹层主要由碳酸盐矿物组成，深层不利于碳酸盐的形成。

关键词: 成因机制, 深水陆棚, 储层特征, 含气页岩, 龙马溪组, 志留系, 四川盆地

Abstract:

Deep reservoirs are among the future major targets for shale gas exploration and development in China. A study on the first Member of deep Longmaxi Formation (Long 1 Member) shales in the Sichuan Basin and its periphery was carried out by means of whole rock component X-ray diffraction (XRD), TOC determination, large thin section and argon ion (Ar+) milling SEM imaging. The results show that, compared with shallow shales, the deep shale reservoirs are characterized by relatively higher silica content, lower TOC, lower silty lamina fraction, higher porosity, and more effective pore networks. From shallow to deep, the silica content increases from 30% to 62%. Accordingly, the contents of carbonate minerals, clay minerals, and TOC decrease from 32%, 33%, and 7.1% to 14.3%, 7.8%, and 4.25% respectively. The stripe-shaped siltstone-bearing lamina developed in deep shale reservoir is significantly lower in content and thickness compared with shallow shales. Organic/inorganic-matter pores micro-fractures are widespread within the black shales. From shallow to deep, the thin section porosity increases from 1.6% to 10.8% along with significantly increasing organic and inorganic pores, as well as micro-fractures (with a proportion increase from 1% to 12%). In deep shales, the organic/inorganic-matter pores and micro-fractures are interconnected to form an effective pore network. In addition, the higher silica content and porosity, as well as effective pore network are possibly associated with the biogenic silica; the relatively lower TOC may be due to the long distance from provenance; and the low silty lamina fraction is related to deep water environment. Biogenic silica can produce and preserve a large amount of organic/inorganic-matter pores and well as micro-fractures during diagenesis. The supply of nutrient substance determines the generation of organic matter, and the distance to provenance is in negative correlation to nutrient supply. Silty lamina is mainly composed of carbonate minerals, which, however, are hard to form in deep reservoirs.

Key words: formation mechanism, deep-water shelf, reservoir characteristics, gas-bearing shale, Longmaxi Formation, Silurian, Sichuan Basin

中图分类号:

TE122.2

王红岩,施振生,孙莎莎,等. 四川盆地及周缘志留系龙马溪组一段深层页岩储层特征及其成因[J]. 石油与天然气地质, 2021, 42(1): 66-75. doi: 10.11743/ogg20210106 Hongyan Wang,Zhensheng Shi,Shasha Sun,et al. Characterization and genesis of deep shale reservoirs in the first Member of the Silurian Longmaxi Formation in southern Sichuan Basin and its periphery[J]. Oil & Gas Geology, 2021, 42(1): 66-75. doi: 10.11743/ogg20210106

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参考文献 43

1	Chalmers G , Bustin R M . A multidisciplinary approach in determining the maceral (kerogen type) and mineralogical composition of Upper Cretaceous Eagle Ford Formation: Impact on pore development and pore size distribution[J]. International Journal of Coal Geology, 2017, 171, 93- 110. doi: 10.1016/j.coal.2017.01.004
2	洪剑, 唐玄, 张聪, 等. 中扬子地区龙马溪组页岩有机质孔隙发育特征及控制因素-以湖南省永顺地区永页3井为例[J]. 石油与天然气地质, 2020, 41 (5): 1060- 1072.
	Hong Jian , Zhang Cong , Huang Huang , et al. Characteristics and controlling factors of organic-matter pores in Longmaxi Formation shale, Middle Yangtze Region: A case study of Well YY3[J]. Oil & Gas Geology, 2020, 41 (5): 1060- 10722.
3	刘文平, 张成林, 高贵冬, 等. 四川盆地龙马溪组页岩孔隙度控制因素及演化规律[J]. 石油学报, 2017, 38 (2): 175- 184.
	Liu Wenping , Zhang Chenglin , Gao Guidong , et al. Controlling factors and evolution laws of shale porosity in Longmaxi Formation, Sichuan Basin[J]. Acta Petrolei Sinica, 2017, 38 (2): 175- 184.
4	Mathia E J , Bowen L , Thomas K M , et al. Evolution of porosity and pore type in organic-rich, calcareous, lower Toarcian Posidonia Shale[J]. Marine and Petroleum Geology, 2016, 75, 117- 139. doi: 10.1016/j.marpetgeo.2016.04.009
5	Katz B J , Arango I . Organic porosity: A geochemist's view of the current state of understanding[J]. Organic Geochemistry, 2018, 123, 1- 16. doi: 10.1016/j.orggeochem.2018.05.015
6	Löhr S C , Baruch E T , Hall P A , et al. Is organic pore development in gas shales influenced by the primary porosity and structure of thermally immature organic matter?[J]. Organic Geochemistry, 2015, 87, 119- 132. doi: 10.1016/j.orggeochem.2015.07.010
7	Pommer M , Milliken K . Pore types and pore-size distributions across thermal maturity, Eagle Ford Formation, southern Texas[J]. AAPG Bulletin, 2015, 99 (9): 1713- 1744. doi: 10.1306/03051514151
8	张廷山, 杨洋, 龚其森, 等. 四川盆地南部早古生代海相页岩微观孔隙特征及发育控制因素[J]. 地质学报, 2014, 88 (9): 1728- 1740.
	Zhang Tingshan , Yang Yang , Gong Qisen , et al. Characteristics and mechanisms of the Micro-pores in the Early Palaeozoic marine shale, southern Sichuan Basin[J]. Acta Geologica Sinica, 2014, 88 (9): 1728- 1740.
9	邹才能, 赵群, 董大忠, 等. 页岩气基本特征、主要挑战与未来前景[J]. 天然气地球科学, 2017, 28 (12): 1781- 1796.
	Zou Caineng , Zhao Qun , Dong Dazhong , et al. Geological characteristics, main challenges and future prospect of shale gas[J]. Natural Gas Geoscience, 2017, 28 (12): 1781- 1796.
10	Melchin M J , Mitchell C E , Holmden C , et al. Environmental changes in the Late Ordovician-early Silurian: Review and new insights from black shales and nitrogen isotopes[J]. Geological Society of America Bulletin, 2013, 125 (11-12): 1635- 1670. doi: 10.1130/B30812.1
11	蒋裕强, 董大忠, 漆麟, 等. 页岩气储层的基本特征及其评价[J]. 天然气工业, 2010, 30 (10): 7- 12.
	Jiang Yuqiang , Dong Dazhong , Qi Lin , et al. Basic features and evaluation of shale gas reservoir[J]. Natural Gas Industry, 2010, 30 (10): 7- 12.
12	郭旭升, 李宇平, 腾格尔, 等. 四川盆地五峰组-龙马溪组深水陆棚相页岩生储机理探讨[J]. 石油勘探与开发, 2020, 47 (1): 193- 201.
	Guo Xusheng , Li Yuping , Borjigen Tenger , et al. Hydrocarbon generation and storage mechanisms of deep-water shelf shales of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Sichuan Basin, China[J]. Petroleum Exploration and Development, 2020, 47 (1): 193- 201.
13	Zou Caineng , Qiu Zhen , Poulton S W , et al. Ocean euxinia and climate change"double whammy" drove the Late Ordovician mass extinction[J]. Geology, 2018, 46 (6): 535- 538. doi: 10.1130/G40121.1
14	王世谦. 页岩气资源开采现状、问题与前景[J]. 天然气工业, 2017, 37 (6): 115- 130.
	Wang Shiqian . Shale gas exploitation: Status, issues and prospects[J]. Natural Gas Industry, 2017, 37 (6): 115- 130.
15	刘宝珺, 许效松, 潘杏南. 中国南方古大陆沉积地壳演化与成矿[M]. 北京: 科学出版社, 1993: 1- 134.
	Liu Baojun , Xu Xiaosong , Pan Xingnan . Evolution and mineralization of earth crust of paleocontinent in South China[M]. Beijing: Science Press, 1993: 1- 134.
16	施振生, 董大忠, 王红岩, 等. 含气页岩不同纹层及组合储集层特征差异性及其成因-以四川盆地下志留统龙马溪组一段典型井为例[J]. 石油勘探与开发, 2020, 47 (4): 829- 840.
	Shi Zhensheng , Dong Dazhong , Wang Hongyan , et al. Reservoir cha-racteristics and genetic mechanism of gas-bearing shales with different laminae and laminae combinations: A case study of Member 1 of the Lower Silurian Longmaxi shale in Sichuan Basin, SW China[J]. Petroleum Exploraton and Development, 2020, 47 (4): 829- 840.
17	施振生, 邱振, 董大忠, 等. 四川盆地巫溪2井龙马溪组含气页岩细粒沉积纹层特征[J]. 石油勘探与开发, 2018, 45 (2): 339- 348.
	Shi Zhensheng , Qiu Zhen , Dong Dazhong , et al. Laminae characteristics of gas-bearing shale fine-grained sediment of the Silurian Longmaxi Formation of Well Wuxi 2 in Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2018, 45 (2): 339- 348.
18	董大忠, 施振生, 孙莎莎, 等. 黑色页岩微裂缝发育控制因素-以长宁双河剖面五峰组-龙马溪组为例[J]. 石油勘探与开发, 2018, 45 (5): 763- 774.
	Dong Dazhong , Shi Zhensheng , Sun Shasha , et al. Factors controlling microfractures in black shales: A case study of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Shuanghe profile, Chang-ning area, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2018, 45 (5): 763- 774.
19	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.
20	冯增昭. 沉积岩石学[M]. 北京: 石油工业出版社, 1993: 1- 368.
	Feng Zengzao . Sedimentary Petrology[M]. Beijing: Petroleum Industry Press, 1993: 1- 368.
21	赵杏媛, 杨威, 罗俊成. 塔里木盆地粘土矿物[M]. 湖北武汉: 中国地质大学出版社, 2001: 1- 293.
	Zhao Xingyuan , Yang Wei , Luo Juncheng . Clay Minerals of the Tarim Basin[M]. Wuhan: China University of Geosciences Press, 2001: 1- 368.
22	Tucker M E , Wright V P . Carbonate sedimentology[M]. Oxford: Blackwell, 1990: 1- 482.
23	赵建华, 金之均, 金振奎, 等. 四川盆地五峰组-龙马溪组含气页岩中石英成因研究[J]. 天然气地球科学, 2016, 27 (2): 377- 386.
	Zhao Jianhua , Jin Zhijun , Jin Zhenkui , et al. The genesis of quartz in Wufeng-Longmaxi gas shales, Sichuan Basin[J]. Natural Gas Geoscience, 2016, 27 (2): 377- 386.
24	刘江涛, 李永杰, 张元春, 等. 焦石坝五峰组-龙马溪组页岩硅质生物成因的证据及其地质意义[J]. 中国石油大学学报(自然科学版), 2017, 41 (1): 34- 41. doi: 10.3969/j.issn.1673-5005.2017.01.004
	Liu Jiangtao , Li Yongjie , Zhang Yuanchun , et al. Evidence of biogenic silica of Wufeng-Longmaxi Formation shale in Jiaoshiba area and its geological significance[J]. Journal of China University of Petroleum (Edition of Natural Science), 2017, 41 (1): 34- 41. doi: 10.3969/j.issn.1673-5005.2017.01.004
25	卢龙飞, 秦建中, 申宝剑, 等. 中上扬子地区五峰组-龙马溪组硅质页岩的生物成因证据及其与页岩气富集的关系[J]. 地学前缘, 2018, 25 (4): 226- 236.
	Lu Longfei , Qin Jianzhong , Shen Baojian , et al. The origin of biogenic silica in siliceous shale from Wufeng-Longmaxi Formation in the Middle and Upper Yangtze reion and its relationship with shale gas enrichment[J]. Earth Science Frontiers, 2018, 25 (4): 226- 236.
26	Brunton FR , Dixon OA . Siliceous sponge-microbe biotic associations and their recurrence through the phanerozoic as reef mound constructors[J]. Palaios, 1994, 9, 370- 387. doi: 10.2307/3515056
27	范方显. 古生物学教授[M]. 东营: 石油大学出版社, 1994: 1- 287.
	Fan Fangxian . Paleontology Tutorial[M]. Dongying: Petroleum University Press, 1994: 1- 287.
28	Tyson R V . Sedimentation rate, dilution, preservation and total organic carbon: some results of a modeling study[J]. Organic Geochemistry, 2001, 32, 333- 339. doi: 10.1016/S0146-6380(00)00161-3
29	Pederson T F , Calvert S E . Anoxia Vs productivity: What controls the formation of organic-carbon-rich sediments and sedimentary rocks[J]. AAPG Bulletin, 1990, 74 (4): 454- 466.
30	Canfield DE . Sulfate reduction and oxic respiration in marine sediments: implications for organic carbon preservation in euxinic environments[J]. Deep-Sea Research, 1989, 36 (1): 121- 138. doi: 10.1016/0198-0149(89)90022-8
31	Hedges J I , Keil R G . Sedimentary organic matter preservation: an assessment and speculative synthesis[J]. Marine Chemistry, 1995, 49, 81- 115. doi: 10.1016/0304-4203(95)00008-F
32	朱筱敏. 沉积岩石学(第四版)[M]. 北京: 石油工业出版社, 2008: 1- 219.
	Zhu Xiaomin . Sedimentary Petrology (The 4th Edition)[M]. Beijing: Petroleum Industry Press, 2008: 1- 219.
33	Aplin A C, Macquaker J H S. Mudstone diversity: Origin and implications for source, seal, and reservoir properties in petroleum systems[J]. AAPG Bulletin, 201, 95(12): 2031-2059.
34	Lazar O R , Bohacs K M , Macquaker J H S , et al. Capturing key attributes of fine-grained sedimentary rocks in outcrops, cores, and thin sections: Nomenclature and description guidelines[J]. Journal of Sedimentary Research, 2015, 85, 230- 246. doi: 10.2110/jsr.2015.11
35	Lambert A M , Kelts K R , Marshall N F . Measurements of density underflows from Walensee, Switzerland[J]. Sedimentology, 1976, 23 (1): 87- 105. doi: 10.1111/j.1365-3091.1976.tb00040.x
36	O'Brien N R . Significance of lamination of Toarcian (Lower Jurassic) shales from Yorkshire, Great Britain[J]. Sedimentary Geology, 1990, 67, 25- 34. doi: 10.1016/0037-0738(90)90025-O
37	Macquaker J H S , Keller M A , Davies S J . Algal blooms and "marine snow": Mechanisms that enhance preservation of organic carbon in ancient fine-grained sediments[J]. Journal of Sedimentary Research, 2010, 80, 934- 942. doi: 10.2110/jsr.2010.085
38	Piper D J W . Turbidite origin of some laminated mudstones[J]. Geological Magazine, 1972, 109 (2): 115- 126. doi: 10.1017/S0016756800039509
39	Yawar Z , Schieber J . On the origin of silt laminae in laminated shales[J]. Sedimentary Geology, 2017, 360, 22- 34. doi: 10.1016/j.sedgeo.2017.09.001
40	刘传联, 徐金鲤, 汪品先. 藻类勃发-湖相油源岩形成的一种重要机制[J]. 地质论评, 2001, 47 (2): 207- 210. doi: 10.3321/j.issn:0371-5736.2001.02.015
	Liu Chuanlian , Xu Jinli , Wang Pinxian . Algal blooms: the primary mechanism in the formation of lacustrine petroleum source rocks[J]. Geological Review, 2001, 47 (2): 207- 210. doi: 10.3321/j.issn:0371-5736.2001.02.015
41	秦亚超. 生物硅早期成岩作用研究进展[J]. 地质论评, 2010, 56 (1): 89- 98.
	Qin Yachao . Research progress in early diagenesis of biogenic silica[J]. Gological Review, 2010, 56 (1): 89- 98.
42	Pommer M , Milliken K . Pore types and pore-size distributions across thermal maturity, Eagle Ford Formation, southern Texas[J]. AAPG Bulletin, 2015, 99 (9): 1713- 1744. doi: 10.1306/03051514151
43	Schieber J . Common themes in the formation and preservation of intrinsic porosity in shales and mudstones-illustrated with examples across the Phanerozoic[J]. SPE-132370, 2010, 1, 1- 10.

取样位置	层位	深度/m	TOC/%	XRD测试矿物含量/%
取样位置	层位	深度/m	TOC/%	粘土矿物	石英	长石	碳酸盐
足202井	龙一¹⁽¹⁾	3 890.75	4.13	17.4	66.7	5.1	7.0
足203井	龙一¹⁽¹⁾	4 101.50	4.76	11.7	70.1	3.7	11.3
威201井	龙一¹⁽¹⁾	1 541.78	5.16	14.3	66.2	2.7	14.5
威201井	龙一¹⁽¹⁾	1 542.60	8.20	12.4	68.1	3.3	11.5
威202井	龙一¹⁽¹⁾	2 571.28	7.10	14.4	71.2	1.6	11.7
自202井	龙一¹⁽¹⁾	3 647.95	4.04	17.1	45.8	11.2	17.9
荣203井	龙一¹⁽¹⁾	4 344.56	1.44	26.6	47.9	4.5	18.5
黄202井	龙一¹⁽¹⁾	4 080.64	3.66	11.4	65.7	2.4	17.9
泸201井	龙一¹⁽¹⁾	3 615.70	4.25	6.5	69.9	2.4	19.4
宁201井	龙一¹⁽¹⁾	2 519.60	7.08	15.0	44.0	2.0	36.0
宁203井	龙一¹⁽¹⁾	2 392.55	4.72	5.0	67.0	4.8	21.5
宁209井	龙一¹⁽¹⁾	3 168.97	5.41	23.8	50.2	2.6	23.4
宁210井	龙一¹⁽¹⁾	2 232.49	4.69	16.5	55.1	0.0	28.4
YS106井	龙一¹⁽¹⁾	1 432.40	5.15	—	—	—	—
YS112井	龙一¹⁽¹⁾	2 455.30	5.25	23.6	36.3	10.9	25.0
YS112井	龙一¹⁽¹⁾	2 456.61	8.90	8.5	12.2	3.6	60.9
宝1井	龙一¹⁽¹⁾	1 273.50	—	33.0	30.0	5.0	32.0
长宁双河剖面	龙一¹⁽¹⁾	—	9.87	16.0	71.0	3.0	10.0

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