海洋地质前沿2017，Vol.33Issue(7)：24-31,8.DOI:10.16028/j.1009-2722.2017.07003
莺歌海盆地中央底辟带天然气差异分布与运聚成藏特征
DIFFERENTIATED GAS DISTRIBUTION, MIGRATION AND ACCUMULATION IN THE CENTRAL DIAPIR BELT OF THE YINGGEHAI BASIN
摘要
Abstract
The gas found in the Yinggehai Basin is a kind of coal-type gas from Miocene source rocks.However,the gas accumulation models based on it is hard to explain the differentiation of gas geochemistry in the Dongfang and Ledong areas.Based on the comprehensive study of gas geochemistry,source rock,tectonic evolution and diapir activity,it is concluded that the coal-type gas can be further subdivided into the Meishan type and the Shanya type.The two groups of gas distributed in the Dongfang area and the Ledong area,are respectively from Meishan source rock and Shanya source rock.The differentiation of distribution depends upon three factors,say:the thickness of Meishan formation,the generation process and the migration system.In the Ledong area,both the gas from Meishan and Shaya Formations can migrate into the shallow and middle deep reservoirs.Same process might happen for the gas from Meishan Formation in the Dongfang area.However,the gas from the Shaya Formation is only accumulated in the cores of diapirs as well as the traps closed to the structural ridge in the Dongfang area.Therefore,the difference in gas accumulation in the Dongfang and Ledong areas are result from the different distribution of gas groups.As both of them are controlled by the diapir activity,the gas accumulations in the Dongfang area and the Ledong area are certainly similar.The similarity and difference should be careful considered in the selection of exploration targets.关键词
天然气/类型划分/分布差异/成藏过程/莺歌海盆地Key words
natural gas/type classification/differentiated distribution/accumulation/Yinggehai Basin分类
天文与地球科学引用本文复制引用
熊小峰,徐新德,甘军,郭潇潇,粱刚..莺歌海盆地中央底辟带天然气差异分布与运聚成藏特征[J].海洋地质前沿,2017,33(7):24-31,8.基金项目
国家重大科技专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术”(2016ZX05024-005) （2016ZX05024-005）
