Exploration potential and favorable direction of tight gas in Middle Jurassic Xiashaximiao Formation in Sichuan Basin
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摘要: 基于对四川盆地中侏罗统下沙溪庙组多年的勘探实践，研究了致密气成藏富集的关键条件，认为下沙溪庙组致密气藏为多层叠置、整体含气的次生构造—岩性气藏，具有明显的源控、相控、位控的“三元”控藏特点：①下侏罗统自流井组、上三叠统须家河组暗色泥岩、碳质泥岩与煤层等多套源岩提供了天然气来源；②冲积扇、三角洲相等沉积体系中的各类河道砂体和泥页岩组合形成的泥包砂结构是有利的富集组合体；③广泛分布的“叶肢介页岩”或紫红色泥页岩层可以作为区域盖层；④喜马拉雅运动之后形成的3大古隆起和3大坳陷，隆坳相间，发育了一系列下沙溪庙组顶部构造，具有全盆地分布形成有利含气圈闭的条件；⑤从须家河组断至下沙溪庙组的断层可以形成远源气藏的运移通道，近源的自流井组烃源可以通过小断层或微裂缝就近输导。据此，建立了下沙溪庙组致密气成藏模式，认为下沙溪庙组具备形成大中型气田的基础，川西地区勘探潜力最大，川北及川南地区次之，川中地区成藏条件配置较差，勘探潜力较差。Abstract: Tight gas is an important gas-pool type for natural gas resource and output increment in China. The Middle Jurassic Xiashaximiao Formation (J2x) is an important target for the exploration of tight oil and gas in the Sichuan Basin. Based on decades of exploration practice and studies on accumulation conditions of tight gas, it was indicated that the J2x formation gas reservoir is a secondary structural lithologic gas reservoir with multiple layers, and was constrained by source, position and sedimentary facies. The major characteristics of these reservoirs are (1) the dark mudstones, carbonaceous mudstones and coal seams in the Lower Jurassic Ziliujing and Upper Triassic Xujiahe formations provided abundant natural gas sources; (2) the mud-packed sand structure formed by the combination of various channel sand bodies and shale in sedimentary systems such as alluvial fans and deltas was favorable for the enrichment of natural gas; (3) the widely distributed "estheria shale" or purple-red mud shale layer acted as regional cap rock; (4) three major paleo-uplifts and three major depressions formed after the Himalayan Movement, developed a series of structures on the top of the Xiashaximiao Formation, which was favorable for the formation of gas-bearing traps distributed throughout the basin and (5) the faults from the Upper Triassic Xujiahe Formation to the Xiashaximiao Formation provided migration channels for far-source gas reservoirs, while gas in the Ziliujing Formation could migrate to near-source reservoirs through small faults or micro-fractures. Thus a tight gas accumulationmodel of the Xiashaximiao Formation was established. The Xiashaximiao Formation possesses the foundation for forming large and medium-sized gas fields. The western part of Sichuan Basin has the largest potential for gas exploration and followed by the northern and southern parts. In the central Sichuan Basin, the reservoir-forming conditions are poorly configured and made its exploration potential poor.
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图 1 四川盆地中侏罗统下沙溪庙组顶部构造埋深
Figure 1. Burial depth of structures on the top of Middle Jurassic Xiashaximiao Formation, Sichuan Basin
图 2 四川盆地下侏罗统自流井组生烃强度平面分布
Figure 2. Hydrocarbon generation intensity of Lower Jurassic Ziliujing Formation, Sichuan Basin
图 3 四川盆地上三叠统须家河组生烃强度平面分布
Figure 3. Hydrocarbon generation intensity of Upper Triassic Xujiahe Formation, Sichuan Basin
图 4 川西中江地区侏罗系下沙溪庙组储层孔隙特征
Figure 4. Pore characteristics of Jurassic Xiashaximiao Formation, Zhongjiang area, western Sichuan Basin
图 5 川西中江地区侏罗系下沙溪庙组储层测井响应特征
Figure 5. Logging response characteristics of Jurassic Xiashaximiao Formation, in Zhongjiang area, western Sichuan Basin
图 6 四川盆地侏罗系下沙溪庙组储层与直接盖层空间关系示意
亮色为储集砂体，暗色为盖层
Figure 6. Spatial relationship between Jurassic Xiashaximiao Formation reservoir and direct seal, Sichuan Basin
图 7 四川盆地侏罗系下沙溪庙组储层分布预测示意
图中红色表示河道砂体
Figure 7. Reservoir distribution of Jurassic Xiashaximiao Formation, Sichuan Basin
图 8 四川盆地侏罗系下沙溪庙组天然气成藏模式
Figure 8. Gas accumulation pattern of Jurassic Xiashaximiao Formation, Sichuan Basin
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[1] 戴金星, 倪云燕, 吴小奇. 中国致密砂岩气及在勘探开发上的重要意义[J]. 石油勘探与开发, 2012, 39(3): 257-264. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201203002.htmDAI Jinxing, NI Yunyan, WU Xiaoqi. Tight gas in China and its significance in exploration and exploitation[J]. Petroleum Exploration and Development, 2012, 39(3): 257-264. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201203002.htm [2] 汪泽成, 邹才能, 陶士振, 等. 大巴山前陆盆地形成及演化与油气勘探潜力分析[J]. 石油学报, 2004, 25(6): 23-28. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB200406006.htmWANG Zecheng, ZOU Caineng, TAO Shizhen, et al. Analysis on tectonic evolution and exploration potential in Dabashan Foreland Basin[J]. Acta Petrolei Sinica, 2004, 25(6): 23-28. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB200406006.htm [3] 郑荣才, 彭军, 吴朝容. 陆相盆地基准面旋回的级次划分和研究意义[J]. 沉积学报, 2001, 19(2): 249-255. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB200102014.htmZHENG Rongcai, PENG Jun, WU Chaorong. Grade division of base-level cycles of terrigenous basin and its implications[J]. Acta Sedimentologica Sinica, 2001, 19(2): 249-255. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB200102014.htm [4] 陈恭洋, 晋静, 罗迎春, 等. 沉积相控制下致密砂岩气藏分布特征: 以四川盆地川西坳陷中段蓬莱镇组为例[J]. 石油与天然气地质, 2017, 38(3): 467-477. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT201703006.htmCHEN Gongyang, JIN Jing, LUO Yingchun, et al. Characteristics of tight sandstone gas reservoir distribution under control of sedimentary facies: a case study from the Penglaizhen Formation in the central Western Sichuan Depression[J]. Oil & Gas Geology, 2017, 38(3): 467-477. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT201703006.htm [5] 文华国, 郑荣才, 叶泰然, 等. 米仓山—大巴山前陆盆地下沙溪庙组高分辨率层序地层学特征[J]. 矿物岩石, 2005, 25(1): 83-90. https://www.cnki.com.cn/Article/CJFDTOTAL-KWYS200501016.htmWEN Huaguo, ZHENG Rongcai, YE Tairan, et al. High resolution sequence stratigraphy of the Lower Shaximiao Formation in the foreland basin of Micang-Daba Mountain[J]. Journal of Mineralogy and Petrology, 2005, 25(1): 83-90. https://www.cnki.com.cn/Article/CJFDTOTAL-KWYS200501016.htm [6] 黄滢竹, 龚文平, 张方. 成都凹陷下沙溪庙组物源分析[J]. 长江大学学报(自然版), 2014, 11(31): 35-38. https://www.cnki.com.cn/Article/CJFDTOTAL-CJDL201431010.htmHUANG Yingzhu, GONG Wenping, ZHANG Fang. Study on provenance of Lower Shaximiao Formation in Chengdu Sag[J]. Journal of Yangtze University (Natural Science Edition), 2014, 11(31): 35-38. https://www.cnki.com.cn/Article/CJFDTOTAL-CJDL201431010.htm [7] 王玮, 黄东, 易海永, 等. 淡水湖相页岩小层精细划分及地球化学特征: 以四川盆地侏罗系大安寨段为例[J]. 石油实验地质, 2019, 41(5): 724-730. doi: 10.11781/sysydz201905724WANG Wei, HUANG Dong, YI Haiyong, et al. Stratigraphic division and geochemical characteristics of freshwater lacustrine shale: a case study of Jurassic Da'anzhai section, Sichuan Basin[J]. Petro-leum Geology and Experiment, 2019, 41(5): 724-730. doi: 10.11781/sysydz201905724 [8] 钱利军, 欧莉华, 郝强. 川西孝泉下沙溪庙组储层特征研究及主控因素[J]. 中国西部科技, 2015, 14(10): 33-36. https://www.cnki.com.cn/Article/CJFDTOTAL-XBKJ201510010.htmQIAN Lijun, OU Lihua, HAO Qiang. Reservoir characteristics and influencing factors of the Middle Jurassic formation in Xiaoquan area of western Sichuan[J]. Science and Technology of West China, 2015, 14(10): 33-36. https://www.cnki.com.cn/Article/CJFDTOTAL-XBKJ201510010.htm [9] 叶素娟, 吕正祥. 川西新场气田下沙溪庙组致密储层特征及储集性影响因素[J]. 矿物岩石, 2010, 30(3): 96-104. https://www.cnki.com.cn/Article/CJFDTOTAL-KWYS201003013.htmYE Sujuan, LÜ Zhengxiang. Reservoir characterization and factors influencing reservoir characteristics of the Lower Shaximiao Formation in Xinchang gas field, western Sichuan, China[J]. Journal of Mineralogy and Petrology, 2010, 30(3): 96-104. https://www.cnki.com.cn/Article/CJFDTOTAL-KWYS201003013.htm [10] 陈迎宾, 王彦青, 胡烨. 川西坳陷中段侏罗系气藏特征与富集主控因素[J]. 石油实验地质, 2015, 37(5): 561-565. doi: 10.11781/sysydz201505561CHEN Yingbin, WANG Yanqing, HU Ye. Characteristics and main factors controlling the Jurassic gas reservoirs in the middle section of the Western Sichuan Depression[J]. Petroleum Geology & Experiment, 2015, 37(5): 561-565. doi: 10.11781/sysydz201505561 [11] 王威, 徐国盛, 倪更生, 等. 川西苏码头构造侏罗系次生气藏成藏条件研究[J]. 石油实验地质, 2009, 31(1): 74-78. doi: 10.11781/sysydz200901074WANG Wei, XU Guosheng, NI Gengsheng, et al. The research on accumulation condition for secondary gas pool in Penglaizhen Formation, the Sumatou structure of west Sichuan[J]. Petroleum Geology and Experiment, 2009, 31(1): 74-78. doi: 10.11781/sysydz200901074 [12] 段文燊, 张虹. 新场气田J3p含气砂体预测研究[J]. 矿物岩石, 1999, 19(2): 37-40. https://www.cnki.com.cn/Article/CJFDTOTAL-KWYS902.007.htmDUAN Wenshen, ZHANG Hong. The research on the prediction of J3p gas-bearing sand of Xinchang gas field[J]. Journal of Mineralogy and Petrology, 1999, 19(2): 37-40. https://www.cnki.com.cn/Article/CJFDTOTAL-KWYS902.007.htm [13] 段文燊, 吴朝容. 川西岩性气藏地震勘探关键技术研究[J]. 西南石油大学学报(自然科学版), 2011, 33(4): 1-6. https://www.cnki.com.cn/Article/CJFDTOTAL-XNSY201104003.htmDUAN Wenshen, WU Chaorong. Key technologies of seismic exploration in lithologic gas reservoir of western Sichuan[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2011, 33(4): 1-6. https://www.cnki.com.cn/Article/CJFDTOTAL-XNSY201104003.htm [14] 吴朝容, 段文燊, 蒋晓红. 河道砂体识别技术[J]. 石油物探, 2003, 42(2): 204-207. https://www.cnki.com.cn/Article/CJFDTOTAL-SYWT200302010.htmWU Chaorong, DUAN Wenshen, JIANG Xiaohong. Identification of channel sand[J]. Geophysical Prospecting for Petroleum, 2003, 42(2): 204-207. https://www.cnki.com.cn/Article/CJFDTOTAL-SYWT200302010.htm [15] 王旭, 李祖友, 严小勇, 等. 川西侏罗系气藏动态特征及开采对策[J]. 中外能源, 2015, 20(2): 53-60. https://www.cnki.com.cn/Article/CJFDTOTAL-SYZW201502018.htmWANG Xu, LI Zuyou, YAN Xiaoyong, et al. Dynamic character and production countermeasure for Jurassic gas reservoirs in west Sichuan[J]. Sino-Global Energy, 2015, 20(2): 53-60. https://www.cnki.com.cn/Article/CJFDTOTAL-SYZW201502018.htm [16] 王大洋, 王峻. 川西前陆盆地中侏罗统沙溪庙组沉积相及平面展布特征研究[J]. 四川地质学报, 2010, 30(3): 255-259. https://www.cnki.com.cn/Article/CJFDTOTAL-SCDB201003003.htmWANG Dayang, WANG Jun. Sedimentary facies and its distribution of the Middle Jurrasic Shaximiao Formation in the West Sichuan Foreland Basin[J]. Acta Geologica Sichuan, 2010, 30(3): 255-259. https://www.cnki.com.cn/Article/CJFDTOTAL-SCDB201003003.htm -
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