石油钻采工艺2016，Vol.38Issue(6)：713-722,10.DOI:10.13639/j.odpt.2016.06.001
南海西部海域高温高压天然气成藏机理与资源前景--以莺-琼盆地为例
Hydrocarbon accumulation mechanism and resource prospect of HTHP natural gas reservoirs in Western South China Sea:a case study on the Ying-Qiong Basin
摘要
Abstract
Many normal-pressure giant gas ifelds have been discovered in the Ying-Qiong Basin, South China Sea, e.g. X1-1 and Y13-1. However, the hydrocarbon accumulation mechanism of HTHP natural gas reservoirs are not ifgured out due to poor-quality seismic data of middle-deep layers, complex HTHP geological conditions and high-dififculty drilling and completion engineering. And as a result, the exploration discovery of HTHP natural gas in the Ying-Qiong Basin is seriously restricted. This paper is aimed at ifnd-ing out the key theories on HTHP hydrocarbon accumulation mechanism of the Ying-Qiong Basin. A series of studies were carried out by using drilling, geological and seismic data, including hydrocarbon generation of source rocks under high temperature and pressure, natural gas dissolution experiment, sedimentation model of large reservoirs under high pressure and temperature, and sealing mechanism of cap rocks. It is indicated that the high temperature ifeld in the Ying-Qiong Basin promotes the gas generation of organic matters, and the high pressure inhibits the gas generation of organic matters in the early stage, but promotes in the late stage. Under high temperature and pressure, natural gas can be exsolved in the form of free gas. In the Ying-Qiong Basin, large non-restricted gravity-lfow submarine fan and restricted gravity-lfow channel sand reservoirs are developed. In the Ying-Qiong Basin, the hydrocarbon accumulation and enrichment of high-pressure gas ifelds is controlled by overpressure sealing. Finally, the hydrocarbon accumulation pattern of HTHP natural gas reservoirs was established as “hydrocarbon generated by land-derived marine source rocks, gas accumulated in gravity lfow reservoirs, gas transported along fractures/overpressure ifssures and gas sealed by overpressure cap rocks”. The research provides theoretical bases for exploration breakthrough of HTHP gas reservoirs in tne Ying-Qiong Basin, and they are used as the reference for the discovery of large and medium high-pressure gas ifelds, such as X13-1/X13-2 and L25-1. In the Ying-Qiong Basin, a series of large, deep high-pressure sags are developed and the overall exploration degree of middle-deep reservoirs is lower, so the potential of natural gas resources is immense.关键词
南海西部海域/高温高压/天然气/成藏机理/资源前景/莺-琼盆地Key words
Western South China Sea/high temperature and high pressure/natural gas/hydrocarbon accumulation mechanism/resource prospect/the Ying-Qiong Basin分类
能源科技引用本文复制引用
谢玉洪..南海西部海域高温高压天然气成藏机理与资源前景--以莺-琼盆地为例[J].石油钻采工艺,2016,38(6):713-722,10.基金项目
“十二五”国家科技重大专项“莺-琼盆地高温高压天然气成藏主控因素及勘探突破方向”（编号2011ZX05023-004）。 （）
