洞庭盆地浅层生物气成藏条件及潜力圈闭评价  

Evaluation of Shallow Biogenic Gas Accumulation Conditions and Potential Traps in Dongting Basin

作　　者：朱伟[1] 曹子剑[1] 王红云[1] 景宝国[2] 

机构地区：[1]湖南科技大学,湖南湘潭211401 [2]中油辽河油田分公司,辽宁盘锦124010

出　　处：《特种油气藏》2014年第4期17-21,151,共5页Special Oil & Gas Reservoirs

基　　金：湖南省科技厅科技计划项目"华容隆起南北缘油气地质特征对比评价与洞庭盆地生物气初探"(2012FJ3046);国家自然科学科学部主任基金"湘中拗陷天然气成藏模式与深盆气探索"(41240019)

摘　　要：洞庭盆地第四系沉积稳定,钻井浅层气显示活跃,具生物气发育潜力。通过钻井取样资料及地震反射波勘探数据2个方面综合研究,得出第四系地层分布与构造形态。运用岩心沉积微相分析识别出多种成因的有利储集砂体。研究区最有利储层为物性条件好的扇三角洲前缘砂体;气源岩为深湖环境的淤泥和黏土层;储层之上的生气层可以成为直接盖层;有利气藏类型为自生自储型的构造-岩性气藏。在扇三角洲沉积相带下倾方向的圈闭极具生物气成藏潜力。In the Dongting basin,the Quaternary deposits are stable and active shallow gas shows have been found during drilling,indicating the potential of biogenic gas development. From combined investigation of drilling sampling and seismic reflection survey data,the Quaternary formation distribution and structural shape have been figured out. Some favorable accumulation sand bodies of multi- origins have been identified by means of sedimentary micro- facies analysis of cores. In the interest area,the fan deltaic front sand bodies with good physical property are the most favorable reservoirs; the sludge and clay layers in deep lake environment are the gas source rocks; the gas generation layer above reservoir may act as the direct cap rock; the favorable gas reservoirs include source- reservoir in one structural- lithologic gas reservoirs. The downdip traps in the fan deltaic sedimentary facies zone are very likely to form biogenic gas accumulation.

关 键 词：浅层生物气 圈闭评价 华容隆起南缘 洞庭盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]