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3D structural modeling integrated with seismic attribute and petrophysical evaluation for hydrocarbon prospecting at the Dhulian Oilfield, Pakistan
Frontiers of Earth Science ( IF 2 ) Pub Date : 2021-08-31 , DOI: 10.1007/s11707-021-0881-1
Umair Khan 1 , Baoyi Zhang 1 , Zhengwen Jiang 1 , Jiangfeng Du 2
Affiliation  

Surface and deep subsurface geological structural trends, stratigraphic features, and reservoir characteristics play important roles in assessment of hydrocarbon potential. Here, an approach that integrates digital elevation modelling, seismic interpretation, seismic attributes, three-dimensional (3D) geological structural modeling predicated on seismic data interpretation, and petrophysical analysis is presented to visualize and analyze reservoir structural trends and determine residual hydrocarbon potential. The digital elevation model is utilized to provide verifiable predictions of the Dhulian surface structure. Seismic interpretation of synthetic seismograms use two-way time and depth contour models to perform a representative 3D reservoir geological structure evaluation. Based on Petrel structural modeling efficiency, reservoir development indexes, such as the true 3D structural trends, slope, geometry type, depth, and possibility of hydrocarbon prospects, were calculated for the Eocene limestone Chorgali, upper Paleocene limestone Lockhart, early Permian arkosic sandstone Warcha, and Precambrian Salt Range formations. Trace envelope, instantaneous frequency, and average energy attribute analyses were utilized to resolve the spatial predictions of the subsurface structure, formation extrusion, and reflector continuity. We evaluated the average porosity, permeability, net to gross ratio, water saturation, and hydrocarbon saturation of early Eocene limestone and upper Paleocene limestone based on the qualitative interpretation of well log data. In summary, this integrated study validates 3D stratigraphic structural trends and fault networks, facilitates the residual hydrocarbon potential estimates, and reveals that the Dhulian area has a NE to SW (fold axis) thrust-bounded salt cored anticline structure, which substantiates the presence of tectonic compression. The thrust faults have fold axes trending from ENE to WSW, and the petrophysical analysis shows that the mapped reservoir is of good quality and has essential hydrocarbon potential, which can be exploited economically.



中文翻译:

结合地震属性和岩石物理评价的 3D 构造建模用于巴基斯坦杜连油田油气勘探

地表和深层地下地质构造趋势、地层特征和储层特征在油气潜力评估中起着重要作用。在这里,提出了一种将数字高程建模、地震解释、地震属性、基于地震数据解释的三维 (3D) 地质结构建模和岩石物理分析相结合的方法,以可视化和分析储层结构趋势并确定剩余油气潜力。数字高程模型用于提供对 Dhulian 地表结构的可验证预测。合成地震图的地震解释使用双向时间和深度等值线模型来执行具有代表性的 3D 储层地质结构评估。基于Petrel结构建模效率,计算了始新世灰岩 Chorgali、上古新世灰岩 Lockhart、早二叠世长石砂岩 Warcha 和前寒武纪盐系地层的真实 3D 构造趋势、坡度、几何类型、深度和油气前景可能性等储层开发指标。轨迹包络、​​瞬时频率和平均能量属性分析被用来解决地下结构、地层挤压和反射层连续性的空间预测。我们根据测井数据的定性解释,评估了早始新世灰岩和上古新世灰岩的平均孔隙度、渗透率、净毛比、含水饱和度和烃饱和度。总之,这项综合研究验证了 3D 地层结构趋势和断层网络,促进了残余油气潜力的估计,并揭示了 Dhulian 地区具有 NE 到 SW(折叠轴)逆冲界的盐芯背斜结构,这证实了构造压缩的存在。逆冲断层的褶皱轴为ENE至WSW,岩石物理分析表明,该图储层质量好,具有重要的油气潜力,可经济开发。

更新日期:2021-09-01
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