摘要
通过对天然气碳同位素、氢同位素和干燥系数关系的分析,划分歧口凹陷的烷烃类天然气成因类型,拓展研究区天然气勘探领域,明确今后勘探方向。歧口凹陷的烷烃类天然气包括生物气、生物—热成因混合气和热成因气3个大类,热成因气是凹陷的主力天然气类型,其探明储量占总储量的95%以上。热成因气按母质类型又划分为陆相油型气和煤成气,油型气按成熟度分为低熟气、成熟气和高熟气,主要来自第三系湖相泥岩;埕海潜山天然气属于高熟煤成气,主要来自石炭系—二叠系煤系烃源岩。今后,歧口凹陷天然气勘探应坚持以中深层为主要层段,以潜山和深层碎屑岩为主要勘探领域,同时加强煤成气资源潜力的研究。
Genetic types of hydrocarbon gases of Qikou sag are divided according to the relationships among carbon isotope,hydrogen isotope and dry coefficient.This study has extended gas exploration field of the study area,makes the future exploration direction clear.Hydrocarbon gases in Qikou sag are divided into three types,which are biogenic gas,mixture of biogenic and thermogenic gas,and thermogenic gas.Thermogenic gas is the main gas type in Qikou sag,with its proven natural gas reserves more than 95% of the total.Thermogenic gas can be further divided into continental oil-type gas and coal type gas.Oil-type gas,including low mature gas,mature gas and high mature gas,mainly comes from Tertiary lacustrine mudstone.Gas in buried hill of Chenghai is coal-high mature gas,which mainly comes from Permo-Carboniferous coal-measure source rocks.Further natural gas exploration in Qikou sag should mainly focus on the middle-deep layers in exploration sections and the buried hill and deep clastic reservoir in exploration fields.And besides,research on coal-formed gas resource potential should be strengthened.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2011年第6期1054-1063,共10页
Natural Gas Geoscience
基金
国家重大科技重大专项(编号:2011ZX05007-05)资助
作者简介
国建英（1971-），男．河北怀安人，高级工程师，博士，主要从事油气地球化学研究．E-mail：gjy_17711224@Petrochina．com．cn．
