下扬子下古生界沉积相研究及有利区评价

摘要/Abstract

摘要：

在系统收集露头、钻井资料基础上,开展了下扬子下古生界沉积相研究及有利区带评价。研究认为下古烃源岩发育的有利相为盆地相、陆棚相,其中晚震旦世分布于皖南、常州—上海地区,早寒武世分布于滁州盐城及石台—安吉,德兴—桐庐地区,早—中奥陶世分布于无锡—南山地区,早志留世分布于无为—南京、宁国—长兴地区;下古储层发育有利相为台地边缘相、局限台地浅滩相,晚震旦世分布于无锡—宜兴—东至、无为—泰州地区,中上寒武统分布于无锡—宜兴—东至、宁镇—巢县地区,早奥陶世分布于泾县—无锡、巢湖—泰州地区;下古盖层发育有利相带主要为早寒武世、早志留世盆地、陆棚相。下扬子下古生界可形成两套常规成藏组合,一是以震旦—早寒武世泥岩为生油岩,以震旦纪灯影组白云岩为储层,以早寒武世荷塘组泥岩为盖层的生储盖组合;二是以早寒武世荷塘组泥岩为生油岩,以中上寒武—奥陶系灰岩、白云岩为储层,以志留系下统高家边组泥岩为盖层的生储盖组合。综合评价出如皋—射阳地区及望江—溧阳地区是下古生界气藏勘探有利区。

关键词: 下扬子, 下古生界, 沉积相, 有利区

Abstract:

Based on the systematic collection of outcrop and drilling data, we evaluated the sedimentary facies of the lower Yangtze and the favorable zone. According to the researches, we found that the basin facies and the continental shelf facies were the favorable facies for the development of the hydrocarbon source rocks. Thereinto, in the upper Sinian, they were distributed in Wannan and Changzhou-Shanghai; in the lower Cambrian, they were in Chuzhou, Yancheng, Shitai-Anji and Dexing-Tonglu; in the lower-middle Ordovician, they were in Wuxi-Nanshan; in the lower Silurian, they were in Wuwei-Nanjing and Ningguo-Changxing. The favorable facies of lower ancient reservoirs were the marginal facies of the platform and the shallow facies of the restricted platform. Thereinto, in the upper Sinian, they were distributed in Wuxi-Yixing-Dongzhi and Wuwei-Taizhou; in the middle and upper Cambrian, they were in Wuxi-Yixing-Dongzhi and Ningzhen-Chaoxian; in the lower Ordovician, they were in Jingxian-Wuxi and Chaohu-Taizhou. The favorable facies of the lower Paleozoic mainly included the lower Cambrian, lower Silurian basin and continental shelf facies. Two sets of conventional reservoir assemblages could form in the lower Paleozoic of the lower Yangtze. One was taking the mud rocks in Sinian-lower Cambrian as the sours rocks, the dolomite in Dengying formation of Sinian as the reservoir, and the mud rocks in Hetang formation of lower Cambrian as the source-reservoir-cap rock group of cap rocks. The other was taking the mud rocks in Hetang formation of lower Cambrian as the sours rocks, the limestone and dolomite in middle-upper Cambria-Ordovician as the reservoir, and the mud rocks in Gaojiabian formation of lower Silurian as the source-reservoir-cap rock group of cap rocks. After the comprehensive assessment, Rugao-Sheyang area and Wangjiang-Liyang area were the the favorable area for gas reservoir exploration in lower Paleozoic.

Key words: lower Yangtze, lower Paleozoic, sedimentary facies, advantageous area

中图分类号:

TE122

柴方园. 下扬子下古生界沉积相研究及有利区评价[J]. 油气藏评价与开发, 2019, 9(2): 7-12.

Fangyuan Chai. Study on Paleozoic sedimentary facies and favorable area evaluation in lower Yangtze basin[J]. Reservoir Evaluation and Development, 2019, 9(2): 7-12.

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