Establishment and Application of a Pattern for Identifying Sedimentary Microfacies of a Single Horizontal Well: An Example from the Eastern Transition Block in the Daqing Oilfield, Songliao Basin, China

Guangjuan Fan, Ting Dong, Yuejun Zhao (), Yalou Zhou, Wentong Zhao, Jie Wang and Yilong Wang
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Guangjuan Fan: School of Earth Sciences, Northeast Petroleum University, Daqing 163318, China
Ting Dong: School of Earth Sciences, Northeast Petroleum University, Daqing 163318, China
Yuejun Zhao: Department of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
Yalou Zhou: Institute of Marxism, Guangzhou College of Applied Science and Technology, Guangzhou 526070, China
Wentong Zhao: School of Earth Sciences, Northeast Petroleum University, Daqing 163318, China
Jie Wang: Department of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
Yilong Wang: Department of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China

Energies, 2023, vol. 16, issue 20, 1-19

Abstract: The study of sedimentary microfacies of horizontal wells is important for improving oil recovery using horizontal well technology. Vertical well data alone do not provide accurate enough information to determine the sedimentary microfacies of horizontal wells. Therefore, a comprehensive method combining the data of both horizontal and vertical wells was established to identify sedimentary microfacies of horizontal wells and applied to a single horizontal well in the Daqing oilfield in China’s Songliao Basin. The results identified the study area as a delta sedimentary environment, mainly subdivided into four microfacies types: a distributary channel, the main overbank sand, the overbank sand, and an interdistributary bay. The criteria for identifying each sedimentary microfacies were established. Among them, the criteria for identifying distributary channels include a natural gamma value continuously less than 90 API; a resistivity value continuously greater than 11 Ω·m; a logging curve, which is typically bell-shaped or box-shaped with very high amplitude and amplitude difference; a mainly siltstone lithology; and a total hydrocarbon content (Tg) continuously greater than 3%. The variations in the two types of channel boundaries (narrowing of the channel boundary and reverse extension of the bifurcated channel boundary) were corrected. The research results can provide guidance for the efficient development of favorable reservoirs in oilfields using horizontal well technology.

Keywords: logging facies analysis; sectional description; channel boundary; distributary channel; sedimentary microfacies (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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