Discovery and Application of the Condensed Layer in Lacustrine Facies

doi:10.11885/j.issn.1674-5086.2016.11.17.02

Abstract

Abstract: The aim of this study was to determine potential reservoirs in the Jurassic Akshabulak Formation, located in Oil Field A in Kazakhstan. Logging curves for multiple wells were compared during a comprehensive reservoir study. A shale layer was discovered, which is distributed almost throughout the entire region, and has electrical characteristics of high natural gamma values and low resistivity. After comprehensive analysis of the shale layer via sequence stratigraphy, the condensed layer was confirmed to have been deposited during extensive flooding. The lateral distributional characteristics of the condensed layer were combined with geological and seismic data to establish a sedimentation model. Analysis of the sedimentation characteristics of the upper stratum of the condensed layer indicates substantial variations in sedimentation thickness at the eastern slope of the oil field. A prograding delta developed on this slope, which indicates the high-water mark period. Its leading edge was very favorable for the development of lithological and stratigraphic reservoirs. This observation was validated during the subsequent drilling and exploration process. A method for locating the condensed layer in lacustrine facies is proposed and provides new insights into the detection of lithological reservoirs.

Key words: lacustrine facies, condensed layer, sequence stratigraphy, sedimentation model, flooding surface

CLC Number:

TE132

WU Guohai. Discovery and Application of the Condensed Layer in Lacustrine Facies[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 67-74.

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