摘要
阿联酋地区碳酸盐岩储层以生物礁、浅滩或礁滩复合体沉积为主,礁滩体的识别与预测、分布规律及其主控因素是储层研究的关键。本文在区域研究的基础上,结合钻井、测井及地震相分析,对阿联酋地区碳酸盐台地边缘礁滩体沉积特征进行了研究,确定了研究区礁滩体的沉积模式、有利发育相带及分布主控因素。根据岩相、地震相与测井相分析,礁滩体岩性以礁灰岩、生物碎屑灰岩为主,滩间海或礁间海以泥灰岩为主。从地震相上看,礁滩体具有丘状外形、双向下超,两翼上覆地层上超;包络面中—强振幅、中—高连续;单个礁滩体内部中—弱振幅、中—差连续的反射特征。礁滩体测井相表现为低伽玛、低密度、低速度、高孔隙度“三低一高”的特征。礁滩体的分布与形成受古纬度、海平面升降、古地貌等诸多因素的控制。海平面升降控制礁滩体的发育规模与横向迁移,台地边缘高能相带控制礁滩体宏观分布,继承性古地形高控制礁滩体的局部发育。研究礁滩体的沉积模式与分布规律,对该区碳酸盐岩储层油气勘探具有重要的指导意义,并对其他地区碳酸盐岩油气勘探具有重要的借鉴作用。
The carbonate reservoirs in UAE are dominated by organic reefs, shoals or reef-shoal complexes. The identification and prediction of reef-shoal bodies, distribution rules and main controlling factors are the key to the reservoir research. On the basis of regional research, and combined with drilling, logging and seismic facies analysis, this paper studies the sedimentary characteristics of reef-shoal bodies at the carbonate platform edge in UAE, and identifies the sedimentary model, favorable facies belts and main controlling factors of distribution of reef-shoal bodies in the study area. According to the analysis of lithofacies, seismic facies and logging facies, the lithology of reef-shoal body is dominated by reef-limestone and bioclastic limestone, while the inter-shoal sea or inter-reef sea is dominated by marl. From the perspective of seismic facies, the reef shoal body has the characteristics of dome-shape, bidirectional downlap, overlying strata on both wings onlap, medium-strong amplitude and medium-high continuity in the envelope surface, and medium-weak amplitude and medium-low continuity reflection within a single reef-shoal body. The reef shoal facies shows the characteristics of low gamma, low density, low velocity and high porosity. The distribution and formation of reef-shoal body are controlled by many factors such as paleolatitude, sea level rise and fall, paleogeomorphology. The sea level rise and fall controls the development scale and lateral transfer of reef-shoal body, the high energy facies belt of platform edge controls the macro distribution of reef-shoal body, and the inherited paleotopography controls the local development of reef-shoal body. The study of the sedimentary model and distribution of reef-shoal body has important guiding significance for oil and gas exploration of carbonate reservoirs in this area, and has important reference value for carbonate oil and gas exploration in other areas.
作者
张鑫
苗顺德
刘小龙
柳万春
陈建华
ZHANG Xin;MIAO Shunde;LIU Xiaolong;LIU Wanchun;CHEN Jianhua(CNOOC International Limited,Beijing 100028,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2022年第5期87-93,共7页
China Offshore Oil and Gas
基金
“十四五”集团公司重大科技项目“‘两岸一带’重点盆地油气富集规律和成藏差异性研究(编号:KJGG2022-0901)”部分研究成果。
关键词
阿联酋
碳酸盐
礁滩体
沉积特征
主控因素
UAE
carbonate
reef-shoal body
sedimentary characteristics
main controlling factors