Technology of Fine Characterization of Lower-class Fault Based on Seismic Forward Modeling and Well-seismic Combination

Abstract

Abstract:

The development practice of complex fault block reservoir shows that, the lower-class fault controls the distribution of remaining oil obviously, therefore, the fine description of the low-class faults is a key to the research of different types of fault block reservoir development technology. Meanwhile, the development of fault block reservoir is facing more and more complicated geological conditions, that is, the faults, erosion, overlap and syndeposition and other geological phenomena often coexist, which have caused complex stratigraphic contact relationship and fracture system. Aiming at solving this problem, a technology of fine characterization of the lower-class fault and its combination has been formed based on seismic forward modeling and well-seismic combination, such as reconstruction of the stratum contrast pattern by well-seismic combination to guide the accurate fault ridge identification, establishment of lower-class fault seismic identification by the combination of multi-well integrated calibration and seismic forward modeling, well-seismic multi-attribute analysis, and well-control multi-horizon tracking for the fine description of fault edge. Then, a new complex fracture system has been rebuilt in Shahejie Formation of region 2 & 6, Gudong Oilfield, based on this method, which has screened out the confusing relationship between oil and water, and achieved high development performance.

Key words: lower-class fault, seismic forward modeling, well-seismic combination, complex fault blockreservoir

CLC Number:

TE122.1

SHU Ningkai, SONG Li, WANG Xinwen. Technology of Fine Characterization of Lower-class Fault Based on Seismic Forward Modeling and Well-seismic Combination[J]. Geoscience, 2017, 31(02): 338-347.

Figures/Tables 11

Fig.1 Genetic types and geometric features of lower-class fault

Fig.2 Roadmap of well-controlled seismic analysis for fine characterization of lower-class fault

Fig.3 Stratum contrast pattern in Shahejie Formation of region 2 & 6, Gudong Oilfield

Fig.4 Stratum contrast patterns of fault, overlap, erosion and their identification

Fig.5 Seismic identification of lower-class fault in Shahejie Formation of region 2 & 6, Gudong Oilfield

Fig.6 Identification of lower-class fault in Shahejie Formation of region 2 & 6, Gudong Oilfield

Fig.7 Well-control seismic attribute analysis in Shahejie formation of region 2 & 6, Gudong Oilfield

Fig.8 Well-seismic multi-horizon tracking for the fine description of fault edge

Fig.9 Old-new fracture system comparison in Shahejie Formation of region 2 & 6, Gudong Oilfield

Table 1 Reserve parameters after fault reidentification

断块	地质储量/万吨	采出程度/%	油水界面/m
GD68-X8	11.2	28.5	-2 479
GD69-1	45.7	35.1	-2 470
GD62	63.9	33.5	-2 322
GD62-1	52.5	34.7	-2 331
GD59-3	11.2	33.1	-2 287
GO6-30-1454	31.5	30.8	-2 254
合计	216	32.6

Table 2 Reserve parameters of Closed small fault block formed in fault reidentification

断块	位置	预测地质储量/万吨	油水界面/m
1	GD13-5北	13.1	-2 329
2	GD68-1西	6.5	-2 519
3	GD65-4西	5.1	-2 355
合计		24.7

References 12

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