莺—琼盆地高温高压领域天然气成藏与勘探大突破

摘要/Abstract

摘要： 经过多年勘探研究与实践，莺—琼盆地已经取得天然气勘探重要进展，但是深层地震资料品质差、地质条件错综复杂、高温高压条件下天然气成藏机理不清晰等不利因素制约了该盆地高温高压中深层领域天然气勘探的进一步突破。以莺—琼盆地高温高压环境下成盆、成藏机理等理论体系及其相关勘探技术方法体系为核心，结合实例精细解剖，综合研究了高温高压条件下天然气成藏机理、成藏主控因素及成藏模式。研究认为：莺—琼盆地高温高压领域天然气资源潜力巨大，为天然气勘探大突破提供了雄厚的物质基础；创新提出“走滑伸展盆地内构造转换带优势物源+不均衡沉降控制重力流展布”新认识；进一步完善了高温高压天然气成藏理论，构建了“走滑伸展控源控砂、超压裂隙输导、多期叠合”的高温高压成藏模式。研究成果为莺—琼盆地高温高压领域大中型油气田勘探突破方向选择以及其他高温高压盆地油气勘探提供了理论依据。近年来相继发现并成功评价X13-1、X13-2、L13-2及L25-1等大中型气田，开创了莺—琼盆地高温高压领域天然气勘探新局面。

关键词: 莺&mdash, 琼盆地；高温高压；成藏机理；天然气；勘探突破

Abstract: Through years of efforts, significant progresses have been made in gas exploration in the Yinggehai-Qiongdongnan (YQ) Basins. However, further breakthroughs in the medium-deep formations with high temperature and high pressure (HTHP) are constrained by unfavorable factors, such as poor quality data seismic, complicated geological conditions and unclear gas accumulation mechanism under HTHP conditions. In this paper, through detailed case study, the HTHP gas accumulation mechanism, main controlling factors and accumulation modes were comprehensively analyzed supported by the systematic theory of basin-forming and gas accumulation mechanisms and relevant exploration techniques under HTHP conditions in the YQ Basins. The results reveal huge gas resource potential in HTHP formations in the YQ Basins, providing abundant source basis for achieving great breakthroughs in gas exploration. Moreover, it is innovatively cognized that predominant provenances exist in structural transfer zones and unbalanced subsidence controls gravity flow distribution within strike-slip extensional basin. The theory of HTHP gas accumulation was upgraded and the HTHP gas accumulation mode of strike-slip extension controlling source and sands, hydrocarbons conducting through overpressure fissures, and multi-stage superimposition was established. The study results provide theoretical evidences for defining exploration targets in medium-large HTHP gas fields within the YQ Basins and carrying out oil and gas exploration in other HTHP basins. In recent years, some medium-large gas fields (e.g. X13-1, X13-2, L13-2, and L25-1) have been discovered and assessed successively, creating a new ground for gas exploration in HTHP formations within the YQ Basins.

Key words: Yinggehai-Qiongdongnan (YQ) Basins, high temperature and high pressure (HTHP), gas accumulation mechanism, natural gas, exploration breakthrough

谢玉洪, 李绪深, 徐新德, 童传新, 熊小峰. 莺—琼盆地高温高压领域天然气成藏与勘探大突破[J]. 中国石油勘探, 2016, 21(4): 19-29.

Xie Yuhong, Li Xushen, Xu Xinde, Tong Chuanxin, Xiong Xiaofeng. Gas accumulation and great exploration breakthroughs in HTHP formations within Yinggehai-Qiongdongnan Basins[J]. China Petroleum Exploration, 2016, 21(4): 19-29.

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