Abstract
The objective area is a complex fault-block reservoir, and is provided by China Petroleum Engineering Design Competition(CPEDC). Reservoir characteristics, including stratigraphic features, vertical changes and section properties (thickness, percentage sand and percentage amalgamation) are documented. Based on comprehensive analysis on structural architecture and reservoir characteristics, a three-dimensional quantitative reservoir modeling is taken at a regional-scale of 69×97×37 m3 with the application of geostatistics as theoretical guidance, and thus high-resolution hierarchical reservoir model is generated with a combination of hierarchical data, structural data, physical data and well trajectory data. Therefore, the established three-dimensional geological model integrates all well-point information and structural information, and provides a basic model for subsequent sedimentary microfacies modeling and property modeling as well. Finally, three-dimensional fence diagrams, connecting-well sections and well group profiles are built successively.
Highlights
To represent spatial objects in three-dimensional space, the related three-dimensional model or data structures have been investigated, such as Grid system, Linear Octree, Fence diagram, Through-well profiles, Tetrahedron Network (TEN), etc [1 - 4]
The modeling data in this paper involves: 1) well drilling data(including well name, x-coordinate, y-coordinate and bushing elevation) which is used for describing well location; 2) well trajectory data, which is used for recording well trajectory such as well deviation and azimuth in an interval for 30 meters; 3) well tops data, which is used for describing drilling horizon and the corresponding depth; 4) well horizon data, used for the stratification of the study area; 5) structural map, which is used for digitizing fault and building constraining surface for horizons
Three aspects need to be considered in fault modeling: the fault geometry is modeled as a surface [15]; how faults terminate in 3D space and the connection relationship between faults; the dip, the angle and the displacement, the relationship between hanging wall and footwall of faults
Summary
To represent spatial objects in three-dimensional space, the related three-dimensional model or data structures have been investigated, such as Grid system, Linear Octree, Fence diagram, Through-well profiles, Tetrahedron Network (TEN), etc [1 - 4]. There are many varieties of geological model generated from different modeling methods and geologists [5, 6]. Fence diagram or profiles represent the inner structure of a geological body and they are the two issues of crucial importance [9, 10], but this allows geologist to understand the geological interior structure and optimize development schema . It is worth conducting detailed studies on reservoir characteristics and three-dimensional architectural structure of the study area
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