摘要
歧口凹陷是黄骅坳陷最富集天然气的地区,截止2007年底探明天然气储量为673.95×108m^3,占全探区的98%。天然气主要分布在板桥断裂构造带和北大港潜山构造带,产气井段在2 000-4 500 m之间。通过对大量天然气地球化学数据的综合分析,认为歧口凹陷天然气以煤型成熟气为主,且成因类型丰富,可划分为生物气、生物—热成因混合气、热成因气和无机气4种,其中以热成因气居多,故此种气是今后的主要勘探领域。通过岩石吸附气轻烃与天然气轻烃的对比,认为歧口凹陷的天然气主要来自Es3段烃源岩,埋深较大的Es1烃源岩和遭受生物降解作用的Es1油藏对天然气储量也有一定的贡献;源于Es3烃源层的天然气是今后勘探的主要方向,对来自Es1烃源层天然气的勘探也要重视和兼顾。
Qikou sag is the most enrichment area of natural gas in the Huanghua depression.Till the end of 2007,the proved gas reserve has been up to 673.95×10^8 m^3,accounting for 98% of the whole depression.Natural gas was mainly distributed in the structural belt of Banqiao fracture and northern Dagang buried hill.The gas-produced interval is in range of 2 000-4 500 m.Based on geochemical data,we consider that most of mature natural gas is of humic origin in the Qikou sag.According to thermal stage of natural gas,four types of natural gas are classified as follows： microbial gas,mixing gas of microbial-thermal gas,thermal biogenic gas and abiogenic gas.The thermal biogenic gas as a main component is the future exploration target.In comparison with light hydrocarbon absorbed in the rock gas and natural gas,we consider that natural gas in the Qikou sag would be mainly originated from the Es3 source rock,and a certain contribution of Es1 source rock and Es1 oil biodegraded play an important role.Thus,natural gas originated from the Es3 source rock is the main goal for future exploration as well as the Es1 source rock.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2010年第4期683-691,共9页
Natural Gas Geoscience
基金
中国石油天然气股份公司重大专项"歧口富油凹陷大油气田勘探及综合配套技术研究"(编号:2008E-030603)资助
关键词
岩石热解轻烃
天然气
地球化学
成因分析
歧口凹陷
黄骅坳陷
Rock pyrolysis light hydrocarbon
Natural gas
Geochemistry
Genesis
Qikou sag
Huanghua depression.
作者简介
王振升（1960-），男，高级工程师，主要从事油气勘探综合地质研究工作．E—mail：982767992@qq．com．
