摘要
崖131气田位于莺歌海盆地和琼东南盆地交界处,其气源长期存在争论。采用天然气GS/MS分析新技术,根据该气田天然气生物标志化合物、有机包裹体生物标志化合物、储集层包裹体温度、油气轻烃组成及碳同位素等资料,对其天然气的气源和混合作用进行综合研究,结果表明:该气田的天然气为典型的混合气,由不同类型有机质、不同热演化程度气源岩生成的天然气(煤成气和高成熟—过成熟海相成因气,以海相成因气为主)混合而成,北区块是Ⅲ型、Ⅱ型干酪根成因的混合气藏,南区块主要是Ⅱ型干酪根成因的气藏。主力气源岩是崖南凹陷沉积中心下第三系崖城组、陵水组的浅海相泥岩,生烃母质具有Ⅱ型干酪根特征。该气田的凝析油为煤成油,在蒸发分馏作用下形成;琼东南盆地存在切穿多层烃源岩的深断裂,形成局部低压带,为产生蒸发分馏作用提供了重要地质背景。图5表3参6(傅宁摘)
YA13 1 gas field is located at the juncture of Yinggehai and Qiongdongnan basins, and its gas source has been argued for a long time. Using the new technique of GS/MS analysis and based on the biomarkers of natural gas and organic inclusion, fluid inclusion temperature of reservoir, carbon isotopic and composition of light hydrocarbon etc., the authors investigate the source and mixing of gas in YA13 1 gas field. The results show that the gas from YA13 1 gas field is a typical mixed gas composed of organics and gas with different types of source rocks and maturity (including coal formed gas and high mature and over mature marine gas, the marine gas is predominant). The northern block is filled with mixed gas from type Ⅲ and Ⅱ kerogens, and the southern block is filled with gas from type Ⅱ kerogens. The major gas source rock is probably the Paleogene marine YC and LS Formations (with type Ⅱ kerogens) in the depocenter center of Yanan seg. The secondary source rock is the coal mudstone of YC and LS Formations underlying YC13 1 gas field. Condensate of YA13 1 gas field is coal formed gas and results from the evaporative fractionation process. The deep fractures in Qiongdongnan basin cut down layers of carbon source rocks to form local low pressure belt, and to provide the main geological background for the evaporative fractionation process.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期19-22,共4页
Petroleum Exploration and Development
基金
中国海洋石油总公司"九五"科技攻关项目
关键词
气田
油气混合
特征研究
油气成因
YA13 1 gas field, Gas condensate, Natural gas, Mixing, Feature, Oil and gas origin, Gas source rock, Qiongdongnan basin, Yanan seg
