板内形变与晚期次生成藏——扬子区海相油气总体形成规律的探讨

ON THE RELATIONSHIP OF THE INTRAPLATE DEFORMATION AND THE SECONDARY FORMATION OF OIL/GAS POOLS——THE GENERAL REGULARITIES OF THE OIL/GAS FORMATION IN MARINE ENVIRONMENT OF THE YANGTZE AREA

孙肇才 邱蕴玉 郭正吾

Sun Zhaocai Qiu Yunyu Guo Zhengwu

地矿部石油地质中心实验室 无锡 2. 地矿部西南石油地质局 成都

Central Lab. of Petroleum Geology, MGMR, Wuxi 2. Southwest Bureau of Petroleum Geology, MGMR, Chengdu

如何将诞育于大洋的板块构造概念,应用于大陆(板内)地质,是近十多年来构造地质学研究(或岩石圈研究计划)的一个重点。而大陆内部的形变研究,特别是受特提斯—喜马拉雅构造域和滨太平洋构造域包围的中国西南和东南(包括了整个扬子区)大陆变形的解释,又是重中之重。在“六五”攻关基础上,“七五”攻关在上述指导思想下,通过进一步的研究,形成了以“板内形变和晚期次生成藏”为核心的一整套在板内地球动力学引导下的油气地质理论体系。

A systematic theory centred by the linkage of intraplate deformation and the secondary formation of oil/gas pools in later stages is proposed through the "7th Five Year National Plan Project" OIL/GAS ASSESSMENT AND GEOLOGICAL STUDIES THROUGHOUT THE YANGTZE AREA. It consists of the following principals: 1. Under the guidance of the mobilism as the fundamental recent geo-science, the evolution models of the geodynamics throughout both the Yangtze Area and completed geological history have been established. Based on the analysis of the severe tectonic reworks by intra-continental mountain-chain buildings of the area in details, the stable regions such as the Sichuan, Central Hubei, Northern Jiangsu-Southern Yellow Sea, have been suggested as the favourable areas for oil/gas exploration. 2. As viewed from plate boundary and unhomogeneous lithsphere of the Yandtze Plate, a concept of "intracontinental mountain-chain" characterized intra-continental subductions has been put forward. This is a fold-thrusting zone with obvious orientations attributed to the orogenic system of the Tethys collisions and its front belt is the major play for oil/gas accumulation of the Yangtze Area. 3. Through the analysis of the typical oil/gas pools in the area, a concept of secondary formation of oil/gas pool is proposed with the following kernels: the phase transformation of oil/gas, solution-release and multiple sources for hydrocarbon. Therefore, the oil/gas prospects in the area have been defined unequivocally. 4. The assemplage of oil/gas pools in the area is outlined as the follows: effective oil/gas sources(S),reservior space(R), trap(T), seal(S), and the time(T)for oil/lgas formation. These understandings not only sum up the regularities of the formation for oil/gas pools in marine environment of the Yangtze Area, but also fill in gaps in the modes of consideration and methodology for oil/gas exploration in rather complex structural regions.

https://doi.org/10.11781/sysydz199102107