雪峰推覆体掩覆的下组合(Z-S)油气资源预测

doi:10.11743/ogg20060315

摘要/Abstract

摘要：

雪峰推覆体震旦纪—志留纪地层位于扬子古板块东南缘大陆斜坡上。经加里东运动,伴随“江南隆起”的上升、剥蚀,而逐步演化为雪峰古陆。加里东期,雪峰推覆体古褶皱样式为向西北推覆的近平卧褶皱构造。再经印支—燕山期多层次的由东南向西北叠加推覆作用,在推覆体的前峰带掩覆了大片古生代地层。据岩相带和地球物理等资料,推测雪峰推覆体推覆距离不超过几十公里,前锋带掩覆下古生界深度约4000 m,掩覆面积至少为3000 km²。雪峰推覆体下组合(震旦系—志留系)为半深海滞流缺氧环境下沉积的黑色碳质泥岩、硅质岩、磷块岩和生物灰岩,有机碳含量为0.01%～4.00%,生油条件良好,加里东期具有油气藏形成过程,沿江南隆起西缘已发现有9个古油藏和残留油气藏。通过虎庄残留油气藏成藏条件分析,油气源来自于下组合(震旦系—志留系)和上组合(上二叠统—下三叠统)海相高成熟-过成熟二次生烃的混合烃源,具有长距离运移和一定的油气保存条件,油气藏形成于燕山晚期—喜马拉雅期,与雪峰推覆体最终定型期相同。由此认为雪峰推覆体掩覆的下组合,有较大的油气资源前景,其中,镇远-凯里-三都一带的弧形地区为有利的勘探地区。

关键词: 平卧褶皱, 虎庄残留油气藏, 油气资源, 雪峰推覆体

Abstract:

Xuefeng thrust nappe was located on the continental slope on the southeastern margin of Yangtze fossil plate during Sinian-Silurian,and evolved progressively into Xuefeng ancient land along with the ascending and erosion of "Jiangnan uplift" during Caledonian movement.The pattern of paleofold in Xuefeng thrust nappe was near recumbent fold thrusting toward northwest during Caledonian.The frontal zone of the thrust nappe overrode large area of Paleozoic strata due to the multiple superimposition and thrusting from southeast to northwest during Indosinian-Yanshanian.Based on lithofacies zones and geophysical data,it is predicted that the thrusting distance of Xuefeng thrust nappe would not exceed dozens of kilometers,the depth of Lower Paleozoic overridden by the frontal zone is about 4000 m,and the overridden area is at least 3000 km².The lower assemblage(Sinian-Silurian) of Xuefeng thrust nappe consists of black carbonaceous mudstone,siliceous rock,phosphate rock and biogenic limestone deposited in a bathyal,stagnant and anaerobic environment with TOC value in the range of 0.01%-4.00% and good oil-generating conditions.Oil and gas pools had been formed in Caledonian,and 9 fossil oil pools and residual oil and gas pools have been discovered along the western margin of Jiangnan uplift.Reservoiring condition analysis of Huzhuang residual oil and gas pools shows that the oil and gas have come from the secondary hydrocarbon generatioin of the marine lower assemblage(Sinian-Silurian) and upper assemblage(Upper Permian-Lower Triassic).Hydrocarbons have experienced long-distance migration and have been accumulated in places having a certain preservation condition.Oil and gas pools have been formed during Late Yanshanian-Himalayan,the same as the finalization of Xuefeng thrust nappe.Therefore,it is believed that the lower assemblage of Xuefeng thrust nappe has relatively large potential of petroleum resources,and the arcuate zone along Zhenyuan-Kaili-Sandu is favorable for exploration.

Key words: recumbent fold, Huzhuang residual oil and gas reservoir, petroleum resources, Xuefeng thrust nappe

中图分类号:

TE122.1

李仲东,罗志立,刘树根,等. 雪峰推覆体掩覆的下组合(Z-S)油气资源预测[J]. 石油与天然气地质, 2006, 27(3): 392-398. doi: 10.11743/ogg20060315 Li Zhongdong,Luo Zhili,Liu Shugen,et al. Assessment of petroleum resources in Lower assemblage under Xuefeng thrust nappe[J]. Oil & Gas Geology, 2006, 27(3): 392-398. doi: 10.11743/ogg20060315

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