Formation and Distribution of Tight Oil of Permian Lucaogou Formation in the Jimsar Sag of Junggar Basin, Northwestern China

Abstract

Abstract:

Based on the data sets of geology, oil production test, logging, rock thin section and geochemistry of Permian Lucaogou Formation (LCG) in the Jimsar Sag of Junggar Basin, we studied the formation and distribution of tight oil. LCG source rocks are excellent level with high total organic carbon and Ⅰ, Ⅱ type kerogens, containing low mature to mature organic matter. The sweet spot sections are large in total thickness, good in continuity, with a variety of lithology. The source rocks and tight reservoirs are widely distributed and form an optimal source-reservoir-caprock combination through space and time, which are beneficial to tight oil accumulation. The abnormal overpressure in LCG provided a drive force for tight oil migration and charging. The excellent level source rocks, reservoirs, optimal source-reservoir-caprock combination, and abnormal overpressure are key factors to tight oil formation. There is oil show in the whole LCG and the tight oil is mainly accumulated in reservoirs related to excellent level source rocks in vertical. The tight oil is mainly distributed in the areas with thick source rocks (>200 m), high TOC (>3.5%) and thick reservoirs (>15 m), and controlled by source rocks and reservoirs in plane.

Key words: tight oil, formation factor, distribution, Lucaogou Formation, Jimsar Sag

CLC Number:

TE122.3

QU Jiangxiu, AIRETI Wufuer, ZHA Ming, CHEN Hong, DING Xiujian, GAO Changhai, SU Yang, LIAN Huan, LAI Ren. Formation and Distribution of Tight Oil of Permian Lucaogou Formation in the Jimsar Sag of Junggar Basin, Northwestern China[J]. Geoscience, 2017, 31(01): 119-128.

Figures/Tables 10

Fig.1 Map of tight oil exploration results of Lucaogou Formation in the Jimsar Sag, Junggar Basin

Fig.2 Generalized stratigraphic column of Lucaogou Formation of J174 Well in the Jimsar Sag, Junggar Basin

Fig.3 Relationship between TOC and S1+S2 of source rocks of Lucaogou Formation in the Jimsar Sag, Junggar Basin

Fig.4 Variation of atomic ratios for kerogen samples of Lucaogou Formation in the Jimsar Sag, Junggar Basin

Fig.5 Thickness distribution of sweet spot sections in Lucaogou Formation of the Jimsar Sag, Junggar Basin

Fig.6 Pore types in the reservoirs of Lucaogou Formation in the Jimsar Sag, Junggar Basin

Fig.7 Profile of reservoir distribution of Lucaogou Formation in the Jimsar Sag, Junggar Basin

Fig.8 Source rocks and tight oil distribution of Lucaogou Formation in the Jimsar Sag, Junggar Basin

Fig.9 Relationship between reservoir physical property and oil bearing grade of Lucaogou Formation in the Jimsar Sag, Junggar Basin

Fig.10 Fluorescent characteristics of hydrocarbon inclusions in fractures of Lucaogou Formation in the Jimsar Sag, Junggar Basin

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