珠江口盆地恩平凹陷海相泥岩盖层有效性评价及应用  

Cap rock effectiveness evaluation and application of marine mudstone in Enping Sag of Pearl River Mouth Basin

作　　者：刘培 于水明 王福国 陶文芳 张庆 许新明 胡坤 

机构地区：[1]中海石油(中国)有限公司深圳分公司研究院,广东深圳518054

出　　处：《天然气地球科学》2017年第3期452-459,共8页Natural Gas Geoscience

基　　金："十三五"国家科技重大专项课题"南海东部海域勘探新领域及关键技术"(编号:2016ZX05024-004)资助

摘　　要：珠江口盆地恩平凹陷中浅层海相泥岩分布广泛,对油气封盖保存具有重要意义。通过对研究区宏观沉积背景的分析,认为盖层有效性体现于平面连续性和垂向封闭性,分别受控于泥岩厚度和突破压力,并影响油气的聚集规模。基于已知油气藏和盖层质量之间的关系,找出盖层保存油气的封堵下限,结合下限值将盖层分为一般盖层、有效盖层和高效盖层3类,并建立评价模型。应用模型评价北部古隆起带盖层质量表明,该带下珠江组及珠海组高效盖层数量较为接近,盖层质量基本相当;下韩江组及上珠江组盖层条件差异较大,该带东段高效泥岩盖层明显多于西段,且与南带油田群相当,其盖层条件优越;从油气保存的角度来看,该带东段分布的各类型目标具有一定勘探潜力。Middle-shallow marine facies mudstone are widely distributed in Enping Sag of Pearl River Mouth Basin.It is of great significance for oil and gas block preservation.According to the analysis of macro sedimentary background in the study area,cap rock effectiveness is embodied in plane continuity and vertical sealing ability,which is controlled by thickness of mudstone and breakthrough pressure,and affects the scale of oil and gas accumulation.Based on the relationship between known oil and cap rock quality,the lower limit of cap rock is determined.Cap rock can be divided into three categories by the lower limit,i.e.,generally cap rock,effective cap rock and high effective cap rock,and the evaluation model is established.Evaluation model used in the northern palaeouplift shows that the cap rock quality in lower Zhujiang Formation is basically the same as that in the Zhuhai Formation with similar number of efficient cap rock.There are large differences about cap rock in lower Hanjiang Formation and upper Zhujiang Formation.The eastern efficient mudstone cap rock is clearly more than the western,and similar to south belt oilfield group.Its cap rock condition is superior.From the point of view of oil and gas preservation,various types of targets have certain exploration potential in eastern belt.

关 键 词：珠江口盆地 恩平凹陷 盖层条件 海相泥岩 突破压力 泥岩厚度 

分 类 号：TE122.221[石油与天然气工程—油气勘探]