3D static modeling and sequence stratigraphy using well logs and seismic data:An example of Abu Roash G member in Bahga oilfield

This research uses both three-dimensional(3D)modeling and geologic well control to piece back together the architectural parts of the Late Cretaceous formations.The goal is to figure out the sizes,directions,locations,and controls of the layers of the fluvial sandstone reservoirs.Sequence stratigraphy is essential for 3D reservoir modeling and petroleum geology understanding in the Bahga oilfield.The purpose of this work is to create a static model that shows the layers and facies distribution in the reservoir interval.We will use data from nine well logs and 22 seismic lines calibrated by the Abu Roash G Member reservoir core intervals to accomplish this.The petrophysical study discovered three parts in the Abu Roash G Member reservoir rock:channel fill that is affected by tides,channel fill that is dominated by tides(intertidal sands),and channel top with lenticular bedded sandstone.The model's findings point to the existence of an NNW-oriented sand body,which could be a prime location to produce hydrocarbons.The original oil in place(OOIP)is about 3,438,279 Stock Tank Barrels(STB),and the oil reserve reaches up to 1,031,484(STB).Sequence stratigraphic analysis using seismic and well log information(SB)reveals that the Upper Cretaceous AR/G reservoir of the Bahga field is characterized by third-and fourth-order stratigraphic sequences,which are constrained by three Maximum Flooding Surfaces(MFS)and two Sequence Boundaries.The integration of the derived geological model and sequence stratigraphic results can lower future extraction risk by identifying the locations and trends of the geologic facies with the necessary petrophysical properties for the hydrocarbon accumulations.

埃及阿布吉拉迪盆地AESW区块上白垩统碎屑岩沉积相及储层特征

埃及阿布吉拉迪盆地白垩系碎屑岩储层发育,具备良好的油气勘探开发前景。以Alam El Shawish West区块(简称为AESW区块)上白垩统Abu Roash组G段(简称为AR-G段)为例,在岩心、铸体薄片、扫描电镜、X射线衍射、压汞实验、物性分析、地化分析及测井资料等研究基础上,对碎屑岩沉积微相及储层特征进行了研究,并对影响储层发育及分布的重要控制因素进行了分析。结果表明:(1)AESW区块AR-G段碎屑岩主要为潮坪沉积,发育潮间带、潮下带亚相及多种微相。(2)砂岩类型以石英砂岩及长石质石英砂岩为主,颗粒分选性及磨圆度较好,成分及结构成熟度较高。(3)储集空间包括剩余原生粒间孔、次生的粒间及粒内溶孔等,依据压汞曲线形态及孔喉半径分布等特征,将砂岩储层分为3类,分别对应于粗-中喉道、中-细喉道及微喉道。(4)储层主要为中孔中渗型,次为中孔低渗型,孔渗相关性较好,储层整体上以孔隙型为主。(5)储层发育及分布受沉积微相及成岩作用等多种因素控制。其中潮下带水下砂坝及潮汐水道砂体物性较好,为区内有利的储层发育微相类型。溶蚀作用能够形成次生储集空间,极大地改善了储层物性条件,最终形成潮坪相砂岩储层。