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引用本文:蒲泊伶,董大忠,王凤琴,王玉满,黄金亮. 沉积相带对川南龙马溪组页岩气富集的影响[J]. 中国地质, 2020, 47(1): 111-120.
PU Boling,DONG Dazhong,WANG Fengqin,WANG Yuman,HUANG Jinliang. The effect of sedimentary facies on Longmaxi shale gas in southern Sichuan Basin[J]. Geology in China, 2020, 47(1): 111-120(in Chinese with English abstract).
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沉积相带对川南龙马溪组页岩气富集的影响
蒲泊伶1,2, 董大忠3,4,5,6, 王凤琴1,2, 王玉满3, 黄金亮3
1.西安石油大学地球科学与工程学院, 陕西 西安 710065;2.西安石油大学陕西省油气成藏地质学重点实验室, 陕西 西安 710065;3.中国石油勘探开发研究院, 北京 100083;4.国家能源页岩气研发(实验)中心, 河北 廊坊 065007;5.中国石油天然气集团有限公司非常规油气重点实验室, 河北 廊坊 065007;6.中国石油集团科学技术研究院, 北京 100083
摘要:
为查明沉积相带对川南龙马溪组页岩气富集的影响,结合地层分布、岩性特征、沉积构造、有机碳含量、矿物组成、储集空间类型等特征,对龙马溪组页岩沉积相类型进行划分,并探讨沉积相带对有效页岩发育的影响,以期为页岩气富集条件评价提供依据。通过研究区6口页岩气井的钻井岩心观察,结合测井响应、实验测试分析,将龙马溪组划分为浅水泥质陆棚亚相、半深水陆棚亚相和深水陆棚亚相3种沉积亚相类型。有机碳含量、有效页岩的发育和分布、矿物组成以及孔隙发育特征是影响页岩气富集的关键因素,而这些因素均受控于沉积相带:沉积水体越深TOC含量越高,距离沉积中心越近TOC含量越高;龙马溪组地层厚度较大,但有效页岩厚度并不大,深水陆棚亚相沉积层段为页岩气富集的有效层段,且有效页岩层向沉积中心方向逐渐增厚;深水陆棚亚相丰富的生物供应为有效页岩带来了更高的有机质含量以及更多的脆性矿物,提高了岩石脆性;龙马溪组页岩中的孔隙类型主要为黏土矿物层间孔与有机质孔,且TOC含量高的沉积相带中有机质孔越发育。综上,深水陆棚亚相页岩具备有机质含量丰富、岩石脆性高、有机质孔发育等特征,是页岩气富集的最有利相带。
关键词:  深水陆棚亚相  页岩气  富集条件  龙马溪组  油气勘查工程  四川盆地
DOI:10.12029/gc20200109
分类号:P618.13
基金项目:国家科技重大专项“大型油气田及煤层气开发”35项目(2017ZX05035)资助。
The effect of sedimentary facies on Longmaxi shale gas in southern Sichuan Basin
PU Boling1,2, DONG Dazhong3,4,5,6, WANG Fengqin1,2, WANG Yuman3, HUANG Jinliang3
1.School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, Shaanxi, China;2.Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, Shaanxi, China;3.CNPC Research Institute of Petroleum Exploration & Development, Beijing, 100083, China;4.National Energy Shale Gas R & D Experimental Center, Langfang 065007, Hebei, China;5.Petro China Key Laboratory of Unconventional Oil & Gas Resources, Langfang 065007, Hebei, China;6.CNPC Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Abstract:
To identify the impact of deposition facies on Longmaxi shale gas enrichment in southern Sichuan Basin, the authors studied sedimentary characteristics, stratigraphic distribution, lithology, sedimentary structures, organic carbon content, mineral composition, reservoir space type and other features as well as the impact of sedimentation on favorable shale distribution with the purpose of providing a basic evidence for the evaluation of shale gas enrichment conditions. By the observation and description of drilling cores from six shale gas wells in the study area and according to log response, experimental analysis, Longmaxi Formation was divided into three subfacies, which are shallow water muddy shelf, half-deep water shelf and deep water shelf. It is shown that shale gas accumulation is affected by organic carbon content, the development and distribution of shale, mineral composition, and the development of pores, which are all controlled by sedimentary facies. The deeper the water, the closer to the deposition center, TOC content is higher; Longmaxi Formation is thick but the effective section is much thinner, and it becomes thicker where it is closer to the deposition center. Organisms deposited in deepwater make the effective shale have higher organic matter content and more brittleness; Main pore types in Longmaxi shale are clay mineral layer pores and organic pores, and organic pores are more developed in the section with higher TOC content. Deep-water shelf is the most favorable facies for shale gas enrichment with abundant organic matter content, high brittleness and abundant organic pores.
Key words:  deep-water shelf  shale gas  favorable factors  Longmaxi Formation  oil-gas exploration engineering  Sichuan Basin