下扬子句容地区上古生界油气成藏模式及控制因素

王东燕; 彭金宁; 邱岐; 吕俊祥

doi:10.11781/sysydz201705640

下扬子句容地区上古生界油气成藏模式及控制因素

doi: 10.11781/sysydz201705640

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

基金项目: 国家科技重大专项（2016ZX05002-06，2017ZX05005-003-02）、中国石化科技开发部项目（P13092）和中国石化油田事业部项目（G5800-12-ZS-YTB64）联合资助。

详细信息

作者简介:
王东燕(1982—),女,硕士,工程师,从事油气地质研究.E-mail:wangdy.syky@sinopce.com.

中图分类号: TE122.3
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出版历程
- 收稿日期: 2017-04-11
- 修回日期: 2017-08-10
- 刊出日期: 2017-09-28

Hydrocarbon accumulation model and controlling factors in the Upper Paleozoic in Jurong area, Lower Yangtze region

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 基于下扬子句容地区海相上古生界油气成藏要素与时空配置关系，通过区域地质分析及重点探井成藏过程的研究，探讨了研究区上古生界可能的油气成藏模式及油气成藏主控因素。研究认为：（1）下扬子句容地区上古生界存在以龙潭组、青龙组为源，以印支期不整合面碳酸盐岩缝洞、龙潭组致密砂岩为储层，葛村组、浦口组泥岩为盖层的生储盖组合。典型钻井构造史与成藏史表明，多期的构造运动使得圈闭处在不断形成和调整的过程中，喜马拉雅晚期的构造抬升作用对油气藏破坏十分明显，长期抬升造成了句容地区油气大量散失。（2）典型油藏解剖表明，研究区主要发育次生残留型、原生保存型及晚期重建型3种油气藏。油气的保存条件是句容地区3种类型油气成藏的关键。另外，青龙组在印支期、燕山期遭受剥蚀、淋滤，形成大量的溶洞、裂缝，是控制不整合面碳酸盐岩缝洞型油藏油气（晚期重建型）分布的另一个重要因素。
- 油气成藏模式 /
- 油藏控制因素 /
- 上古生界 /
- 句容地区 /
- 下扬子区
Abstract: The main controlling factors of a hydrocarbon accumulation model of the upper Paleozoic in the Jurong area of the Lower Yangtze region were discussed. Regional geology and hydrocarbon accumulation processes in some key exploration wells were studied using the relationship between oil and gas accumulation elements and the spatial-temporal distribution of the marine strata in the Upper Paleozoic in the study area. The results showed that: (1) The Upper Paleozoic Longtan and Qinglong formations provided source rocks, carbonate fractures on the Indosinian unconformity surface and the tight sandstones in the Longtan Formation worked as reservoirs, and the shale in the Gecun and Pukou formations functioned as cap rocks. The tectonic and accumulation histories obtained from typical exploration wells indicated that traps were formed and adjusted continuously due to multiple tectonic activities. The tectonic uplift during the late Himalayan period destroyed hydrocarbon reservoirs, leading to a great loss of oil and gas in Jurong area. (2) Three classes of oil and gas reservoirs developed, including the secondary residual, primary preservation and the late reconstruction types. Preservation conditions for oil and gas were the key factors for hydrocarbon accumulation in Jurong area. The Qinglong Formation experienced erosion and leaching during the Indosinian and Yanshanian periods, forming a large number of caves and cracks, which controlled the late reconstruction of fractured-vuggy carbonate reservoirs on the unconformity surface.
- hydrocarbon accumulation model /
- reservoir controlling factor /
- Upper Paleozoic /
- Jurong area /
- Lower Yangtze region

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