Factors Influencing Shale Oil Production and Sweet Spot Evaluation of Fengcheng Formation，Mahu Sag

doi:10.7657/XJPG20220611

Abstract

Abstract:

The Fengcheng formation in the Mahu sag is of great potential in shale oil resources. However，its characteristics such as complex lithology，diverse mineral species，thin single layer，scattered sweet spots，and variable fracture occurrence make sweet spot selection challenging，which seriously affects the exploration process. Through the studies on the qualities of source rock，reservoir and engineering，and fracturing scale，the influences of TOC，chloroform bitumen “A” content，porosity，oil saturation，free oil content，brittleness index，pore pressure，two-directional stress difference and fracture development degree on production were systematically analyzed. The results show that the shale oil production from the Fengcheng formation are mainly controlled by four factors such as free oil content，brittleness index，fracture development degree，and large-scale volume fracturing. By using the logging data from 12 wells in the study area，the correlation between production and the controlling factors was analyzed，and a sweet spot classification standard suitable for the Fengcheng formation was established. The classification standard was successfully applied to the horizontal well Maye-1H for dividing sections and clusters，and it may provide a reference for subsequent exploration deployment.

Key words: Junggar basin, Mahu sag, Fengcheng formation, shale oil, reservoir classification, NMR logging, influencing factor of production, sweet spot evaluation

CLC Number:

TE112.24

LIU Caiguang, JI Ruixue, WANG Wei, ZHANG Rong. Factors Influencing Shale Oil Production and Sweet Spot Evaluation of Fengcheng Formation，Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(6): 733-742.

Figures/Tables 9

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Table 1.

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Table 2.

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