四川盆地川西坳陷印支早期古隆起发育特征及控油气作用

Developmental characteristics and oil control of Indosinian paleo-uplifts in West Sichuan Depression, Sichuan Basin

胡烨 袁晓宇 王彦青 刘光祥 宋晓波

HU Ye YUAN Xiaoyu WANG Yanqing LIU Guangxiang SONG Xiaobo

1. 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126; 2. 常州工学院, 江苏 常州 213032; 3. 中国石化 西南油气分公司 勘探开发研究院, 成都 610059

1. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China; 2. Changzhou Institute of Technology, Changzhou, Jiangsu 213032, China; 3. Exploration and Development Research Institute, SINOPEC Southwest Branch Company, Chengdu, Sichuan 610059, China

盆地中古隆起对早期油气聚集成藏具有重要意义。应用三维地震资料及钻探资料，对四川盆地川西坳陷印支期古隆起发育特征进行了研究。结果表明：印支期川西地区不仅发育了孝泉—新场—丰谷近东西向古隆起的雏形，在龙门山前和川西坳陷内部还发育北东走向的“串珠”状古隆起；地震属性揭示，印支期古隆起对中三叠统雷口坡组顶部裂缝的展布以及岩溶储层发育具有明显的控制作用。综合考虑储层展布特征、古隆起与储层叠合程度、烃源条件与油气运移通道匹配关系等认为，除了大型构造隆起带和斜坡带，川西凹陷印支早期古隆起区也可能是油气有利勘探区带。

The paleo-uplift of a basin is of great significance for the positioning of oil and gas fields. In this paper, the characteristics of the Indosinian paleo-highs in the West Sichuan Depression of the Sichuan Basin were studied in combination with the newly completed 3D seismic and drilling data. The study showed that in the Indosinian epoch in the western Sichuan area, not only the east-westward prototype of the uplift in the Xiaoquan-Xinchang-Fenggu area, but also the north-eastward "beaded" paleohighs in front of the Longmen Mountain and in the West Sichuan Depression developed. Seismic attributes revealed that the Indosinian paleo-uplift had significant control over the distribution of fractures on the top of Leikoupo Formation and the development of karst reservoirs. Considering reservoir distribution characteristics, paleo uplift and reservoir overlap, hydrocarbon source conditions and fracture migration channels, it was concluded that in addition to large tectonic uplift zones and slope zones, the Indosinian paleo-uplifts in the West Sichuan Depression might be favorable for hydrocarbon exploration.

国家自然科学基金（41872122）、国家科技重大专项“大型油气田及煤层气开发”（2016ZX05002-006）和“南方海相碳酸盐岩大中型油气田分布规律及勘探评价”（2017ZX05005-003）资助。

https://doi.org/10.11781/sysydz201805650