Comprehensive evaluation and exploration practice of Sha 4 lacustrine shale oil in Damintun sag, Liaohe depression

doi:10.3969/j.issn.1672-7703.2019.05.010

Abstract

Abstract: Shale oil is a new hotspot in unconventional oil and gas exploration. Shale oil in the Liaohe depression is abundant and deemed to be one of the most significant successive resources. The Sha 4 Member in Damintun sag is composed of oil shale, argillaceous dolomite, carbonate-bearing oil shale, silt-bearing oil shale and siltstone. They have good hydrocarbon generating conditions and provide a material basis for shale oil resources. According to the geological conditions of the study area, a “three-quality” evaluation method for shale oil is proposed: ① Evaluate the quality of source rocks to determine oil enrichment zones; ② Considering factors such as crude oil viscosity, permeability and formation pressure, calculate the flow quality curve that characterizes reservoir permeability, and identify high-permeability zones; ③ Evaluate brittleness and fracturability, find engineering sweet spot zones, and select target fracturing zones by calculating brittle composition and analyzing geostress anisotropy. Test data of old wells and drilling data of new wells show that the Sha 4 Member in Damintun sag is favorable for shale oil exploration. Using the “three-quality” evaluation method to select sweet spot zones and conduct effective fracturing stimulation, it is helpful to constructing industrial capacity and approaching to a promising exploration future.

Key words: Damintun sag, “three-quality&rdquo, evaluation, shale oil, fractures, sweet spot prediction

CLC Number:

Li Xiaoguang, Liu Xingzhou, Li Jinpeng, Tian Zhi. Comprehensive evaluation and exploration practice of Sha 4 lacustrine shale oil in Damintun sag, Liaohe depression[J]. China Petroleum Exploration, 2019, 24(5): 636-648.

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