摘要
为提高南海深水区油气勘探成功率,降低油气勘探的风险及成本,在珠江口盆地白云凹陷深水区首次应用了微生物地球化学勘探技术。该技术以轻烃微渗漏理论为基础,采用微生物学方法和地球化学方法直接检测有利目标区之上海底表层的微生物异常和吸附烃异常,预测下伏有利目标区目的层段是否存在油气藏,并预测油气藏的含油气性质。针对白云凹陷深水区复杂地质条件、多种圈闭类型和不同的油气藏类型,利用已钻构造作为微生物地球化学检测的正演模型,对新发现圈闭的含油气性进行了预测,最终将油气微生物地球化学勘探的研究成果与地震、钻井、测井、岩心等资料相结合,对微生物异常分布与油气富集规律间的关系作出了合理的地质解释,并对有利圈闭和区带进行了含油气评价,从而实现了直接发现油气藏的目的。应用实践表明,在白云凹陷深水区采用微生物地球化学烃类检测技术与常规勘探技术相结合的综合勘探新模式,能够较好地预测有利圈闭的含油气性。
Abstract： A technique of microbiological geochemistry was firstly applied in Baiyun sag deep water area, Pearl River Mouth basin, in order to improve the success rate and reduce the risk and cost of deep water hydro carbon exploration in South China Sea. Based on the theory about light hydrocarbon micro-seepage, this technique employs the microbiological and geochemical methods to directly detect microbial and adsorbed-hy- drocarbon anomalies on the sea floor above favorable target strata, so as to predict if there would be any hy- drocarbon accumulation in the target strata and to predict the hydrocarbon accumulation＇ s properties. In consideration of the complex geology, multiple trap types and various types of hydrocarbon accumulation in Baiyun sag deep water, the drilled structures were used as a forward model for the microbiological geo- chemistry detection to predict the hydrocarbon poten tial of the new-discovered prospects. Finally, the ex ploration and research results of microbiological geo- chemistry were combined with seismic, drilling, logging and core data, the relationship between microbial anomalies and hydrocarbon enrichment was reasonably interpreted in geology, and the hydrocarbon potential was evaluated for the favorable prospects and plays, a- chieving the aim of directly detecting hydrocarbon accumulations. The actual application has indicated that the comprehensive exploration mode of microbiological geochemistry in combination with the conventional ex ploration can predict the hydrocarbon potential of fa- vorable prospects quite well in Baiyun sag deep water.
出处
《中国海上油气》
CAS
CSCD
北大核心
2014年第4期15-19,共5页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司综合科研课题"珠江口盆地白云凹陷油气微生物勘探"部分研究成果
关键词
微生物地球化学勘探技术
油气勘探
深水区
白云凹陷
珠江口盆地
Key words： technique of microbiological geochemistry
hydrocarbon exploration
deep water area
Baiyun sag
Pearl River Mouth basin
