Paleogene Source-constrained Seismic Reservoir Predictions in A Oilfield of the Southern Bohai Sea

doi:10.11885/j.issn.1674-5086.2016.11.18.01

Abstract

Abstract: Seismic reflections from the upper Oil Layer I (within the Middle of the Sha 3 Member in Shahejie Formation) in A Oilfield in the Southern Bohai Sea only returned a single peak, while the reservoir's thickness changed rapidly in the horizontal direction, and the accuracy of well-seismic ties were also very poor in this region. These issues posed difficulties for further improvements in the accuracy of reservoir predictions. The analysis of heavy mineral data indicated that the main source of the upper Oil Layer I in middle-western plates of the oilfield is the southwestern Kendong Uplift. The eastern plate on the other hand, is controlled by sources in the northeastern Laibei Uplift, and multi-source sedimentation is the key factor underlying the low accuracy of well-seismic ties. Based on previous well-seismic data analyses, optimal seismic amplitude attributes were selected for the analysis of amplitude attributes and sandstone content in 38 drilled wells in the upper Oil Layer I, and it was found that these quantities were linearly correlated when source-constrained. The smaller the amplitude attributes of sediments from the same source, the higher is the sandstone content, and vice versa. Source-constrained seismic reservoir predictions quantified the relationship between amplitude attributes and sandstone content, improving the accuracy of reservoir predictions in the upper Oil Layer I of the Middle of the Sha 3 Member in Shahejie Formation.

Key words: Laizhou Bay Depression, sources, heavy minerals, well-seismic ties, amplitude attributes, sandstone content

CLC Number:

TE122

ZHANG Jianmin, QIAN Geng, ZHU Jianmin, ZHANG Lan, YUE Honglin. Paleogene Source-constrained Seismic Reservoir Predictions in A Oilfield of the Southern Bohai Sea[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 15-24.

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