Abstract
The shale oil reservoir in the Lucaogou Formation in the Jimsar Sag, Junggar Basin has a complex lithology, complex pore structure, and strong heterogeneity. Conventional logging reservoir evaluation methods have difficulty accurately evaluating the lithology, physical properties, electrical properties, oil-bearing properties, source rock characteristics, brittleness, and horizontal in-situ stress. Starting from the logging response characteristics of complex lithologies, a multilevel, multi-logging parameter combination shale oil logging evaluation is proposed, and an evaluation model of the “seven properties” of shale oil reservoirs is established. This model is used to interpret the data in the study area and achieves good results, effectively solving the “three types of quality” evaluation problems of shale oil source rock quality, reservoir quality and engineering quality. Based on the comprehensive evaluation of the seven properties of logging, it is proposed that the lithology of the Lucaogou Formation shale oil determines the physical properties, brittleness, source rock properties, rock mechanical properties, contact relationships with the reservoir and physical property controls on the oil-bearing property; the “sweet spot” of shale oil in the Lucaogou Formation is clarified, providing effective support for the development of shale oil in the Jimsar Depression.
Highlights
The success of North American shale oil and gas shows that the shale oil resources in the source rocks in the basin are far greater than the conventional oil resources outside the source
The core issues of shale oil logging evaluation mainly include three aspects: the first aspect is source rock evaluation, which highlights the calculation of source rock hydrocarbon generation and hydrocarbon expulsion capacity; the second aspect is reservoir evaluation; and the third aspect is engineering quality evaluation, which focuses on determining the orientation of in-situ stress and its evaluation of anisotropy and optimization of favorable fracturing intervals
Engineering quality evaluation mainly refers to the evaluation of “brittleness” and “in-situ stress and anisotropy” because parameters such as the brittleness index, in-situ stress orientation, size, and anisotropy are used for shale oil horizontal well bore trajectory optimization and fracturing plan designs
Summary
The success of North American shale oil and gas shows that the shale oil resources in the source rocks in the basin are far greater than the conventional oil resources outside the source. Petrologic Characteristics of Shale Oil Reservoirs The Permian Lucaogou Formation in the Jimsar Sag is mainly a set of mixed rocks, including silty fine sand, mud, and carbonates, FIGURE 1 | Location map of the study area.
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