川西坳陷中段陆相地层压力演化及其成藏意义

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1 PETROLEUM EXPLORATION AND DEVELOPMENT Vol.39 No.4 文章编号 : (2012) 川西坳陷中段陆相地层压力演化及其成藏意义 1,2 1,2 1, 基金项目 : CB 摘要 : 关键词 : 中图分类号 :TE122.1 文献标识码 :A Evolution of continental formation pressure in the middle part of the Western Sichuan Depression and its significance for hydrocarbon accumulation Guo Yingchun 1,2, Pang Xiongqi 1,2, Chen Dongxia 1,2, Leng Jigao 3, Tian jun 3 (1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing , China; 2. Research Center for Basin and Reservoir, College of Geosciences, China University of Petroleum, Beijing , China; 3. Exploration and Development Research Institute, Southwest Branch Company, Sinopec, Chengdu , China) Abstract: Based on the distribution features of present formation pressure, analysis on logging data, and genetic mechanisms of abnormal pressure, the overpressure evolution was reconstructed using numerical basin simulation and other quantitative analysis methods. The phase differences of pressure increasing mechanisms, enhancement differences among different mechanisms, and the control of geopressure evolution on gas migration and accumulation were discussed. The causes of overpressure in the Xujiahe Formation include under-compaction (from early Late Triassic to the end of the Jurassic), hydrocarbon generation (from end of the Early Jurassic to the Neogene) and tectonic compression (since the Cretaceous). It is suggested that tectonic compression and hydrocarbon generation are the principal factors of the present overpressure in the Xujiahe Formation. Overpressure transmission is the main cause of overpressure in the Jurassic strata which occurred during the intense tectonic activity periods since the Cretaceous. The overpressure is the main force for hydrocarbon migration and overpressure-related microfractures are the major pathways for gas migration. Fault transport and overpressure driving caused the formation of Jurassic secondary gas reservoirs with distant sources. The areas with high pressure coefficient in the Jurassic and high-overpressure zones in the Xujiahe Formation are optimum targets for exploration. Key words: abnormal pressure; under-compaction; hydrocarbon generated overpressure; tectonic compression; overpressure transmission; hydrocarbon accumulation; Western Sichuan Depression Hunt [1] 3 [2-4] [5-6] [7-9] [10-12] [4]

2012 8 427 [13] [14] [15] [16] 1 4 10 4 km 2

2 [13] [14] [15] [16] km 2 [17-18] 1 图 1 川西坳陷构造单元分区图 [5] 现今压力分布特征

428 Vol. 39 No.4 1.0 1.5 1.5 2.0 2 图 2 川西坳陷中段气藏实测压力系数散点图 2.2 须家河组超压成因 2.2.1 100 m/ma 3 200 m [19] 4 2.

3 428 Vol. 39 No 图 2 川西坳陷中段气藏实测压力系数散点图 2.2 须家河组超压成因 m/ma m [19] TOC=2% HI=100 mg/g 80% 0.6 [20] [21] 图 3 川西坳陷中段须家河组沉积特征 3 1

2012 8 429 J 3 p J 3 sn J 2 s J 2 x J 2 q J 1 b T 3 x 5 T 3 x 4 T 3 x 3 T 3 x 2 图 4 川西坳陷孝泉新场合兴场丰谷构造带地层最大埋深时期的压力系数表 1 川西坳陷中段主要烃源岩层生排烃特征 / / / 10 8 m 3 km 2 10 8 m 3 km 2 10 9 m 3 km 2 10 50 4.8 35.

4 J 3 p J 3 sn J 2 s J 2 x J 2 q J 1 b T 3 x 5 T 3 x 4 T 3 x 3 T 3 x 2 图 4 川西坳陷孝泉新场合兴场丰谷构造带地层最大埋深时期的压力系数表 1 川西坳陷中段主要烃源岩层生排烃特征 / / / 10 8 m 3 km m 3 km m 3 km A A Ma 137 Ma 96 Ma 30 MPa [22] f [23] ( ) V = V p 1 E Vf = pv 2 K = E Kf 3 3(1 2 ) f V( p) pv 4 E K p 1 Tc = = 1+ EK / f f 5 V m 3 V m 3 σ GPa p GPa E GPa V f m 3 f K f GPa T c

430 Vol. 39 No.4 5 2 0.969 0.713 图 5 川西坳陷中段 A A 测线剩余地层压力演化史表 2 川西坳陷中段构造挤压应力的超压贡献 /MPa /% /GPa /GPa /km /% /MPa 26.2 12.3 9.19 22 4.0 77.25 20.24 0.506 32.8 9.6 9.19 22 3.3 81.31 26.67 0.808 36.5 8.

5 430 Vol. 39 No 图 5 川西坳陷中段 A A 测线剩余地层压力演化史表 2 川西坳陷中段构造挤压应力的超压贡献 /MPa /% /GPa /GPa /km /% /MPa [24] [25][24]

2012 8 431 3 6 0.8 1.0 1.5 0.2 图 6 川西坳陷中段须家河组地层压力演化多因素综合分析 2.3 侏罗系超压成因 3 40 m/ma δ 13 C 1 -R o 3 1.65 1.8 1.9 1.9 表 3 川西坳陷中段侏罗系天然气来源分析 /m / /% /m /m L652 1 540 J 2 s 34.40 1.00 3 193.52 1 653.

6 图 6 川西坳陷中段须家河组地层压力演化多因素综合分析 2.3 侏罗系超压成因 3 40 m/ma δ 13 C 1 -R o 表 3 川西坳陷中段侏罗系天然气来源分析 /m / /% /m /m L J 2 s T 3 x 5 MS J 2 s T 3 x 5 MB J 3 p T 3 x 4 CX J 2 s T 3 x 5 CH J 3 p T 3 x 4 X J 3 p T 3 x 5 L J 2 s J 1 z

432 Vol. 39 No.4 1.69 7 [26-27] 3 图 7 川西坳陷中段新场合兴场地区断裂发育特征 4 [28] 1.2 1.5 1.5 2.0 2.0 参考文献 : [1] Hunt J M. Generation and migration of petroleum from abnormally pressured fluid compartments[j].

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, 彭平安. Characteristics and hydrocarbon generation kinetics of the Carboniferous source rocks in the Ludong-Wucaiwan area, the Junggar Basin 1,2, 邹艳荣

, 彭平安. Characteristics and hydrocarbon generation kinetics of the Carboniferous source rocks in the Ludong-Wucaiwan area, the Junggar Basin 1,2, 邹艳荣第 43 卷第 5 期 Vol.43, No.5, 502 509 2014 年 9 月 GEOCHIMICA Sept., 2014 - 颜永何 1,2, 邹艳荣 1*, 屈振亚 1,2, 蔡玉兰王绪龙 3, 潘长春 1 1, 彭平安 (1., 510640; 2., 100049; 3., 841000) 摘要 : -,, -,,, -,,, - ( 264 Ma ),, ( 61 Ma ) 232~196