Characteristics and Controlling Factors of Deep Buried Reservoir in the Southern Margin of Junggar Basin

Si, Xueqiang; Guo, Huajun; Yuan, Baiyan; Xu, Yifan; Peng, Biao; Shan, X.

doi:10.3997/2214-4609.202010815

Cited by 2 publications

(3 citation statements)

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“…We used the data of Well XH1 drilled in a neighboring area, showing sandstone impedance of 9,000-12,000 g/cm 3 × m/s, mudstone impedance of 12,000-13,000 g/cm 3 × m/s, and sandy conglomerate impedance over 13,000 g/cm 3 × m/s. 1) Toutunhe section, Kalazha formation, medium sandstone; 2) Changshan 1,764.16 m, Kalazha formation, medium fine sandstone; 3) Qingshuihe section, Kalazha formation, glutenite (Si et al, 2020;internal communication); 4) Hutan 17,365.3 m, Kalazha formation, silty fine sandstone; 5) Hutan 17,366.45-7,366.5 m, Kalazha formation, siltstone; 6) Changshan 1,764.5-764.6 m, Kalazha formation, fine sandstone; 7) Changshan 1,764.6-764.7 m, Kalazha formation, fine sandstone; and 8) physical property histogram of sandstone reservoir of Kalazha formation.…”

Section: Reservoir Properties and Predictionmentioning

confidence: 99%

Lithologic Hydrocarbon Accumulations in the Upper Jurassic Kalazha Formation in the Foreland Slope, the South Marginal Junggar Basin, Northwest China

Liu

et al. 2022

Front. Earth Sci.

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The foreland slope in the south marginal Junggar Basin (SMJB) is geologically favorable for mass lithologic oil and gas reservoir accumulation. Based on outcrops, thin sections, individual-well facies, and cross-well stratigraphic correlation, the stratigraphic distribution and features of the Upper Jurassic Kalazha Formation were investigated in the SMJB. There are two sedimentary sources in the southwest and southeast Kalazha Formation, which thin out from south to north and vanish in the northern slope. Fan deltas occur in the southwest, and braided river deltas occur in the southeast. Kalazha reservoir rocks and sedimentary facies were predicted using joint 2D and 3D seismic impedance inversion. According to the overall analysis, the Kalazha Formation in the foreland slope is favorable for hydrocarbon accumulation, considering structural highs as the destination of long-term hydrocarbon migration and the updip wedge-out zone in the north with potential lithologic traps. The accumulation model was established with source rocks, reservoir rocks, caprocks, and migration systems for the lithologic hydrocarbon reservoirs in the Kalazha Formation in the SMJB. As per the model and regional stratigraphic and structural features, Kalazha lithologic hydrocarbon reservoirs mainly formed in the annular updip wedge-out zone in the foreland slope. Our deliverables may provide useful information for mass lithologic hydrocarbon accumulation in the foreland slope and deep to ultra-deep hydrocarbon exploration in the SMJB.

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Section: Reservoir Properties and Predictionmentioning

confidence: 99%

Lithologic Hydrocarbon Accumulations in the Upper Jurassic Kalazha Formation in the Foreland Slope, the South Marginal Junggar Basin, Northwest China

Liu

et al. 2022

Front. Earth Sci.

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“…Breakthroughs have been made for oil and gas exploration of tight sandstones in Sikeshu sag in the southern margin of Junggar Basin [1][2][3], revealing that multiple sets of highquality sandstone reservoirs exist in the lower assemblage of the southern margin [4][5][6][7]. The average reservoir depth is approximately 5800-6000 m, and the pressure coefficient is 1.6-2.3 [8]. Thus, it is a typical high-temperature and highpressure ultradeep reservoir [1,8].…”

Section: Introductionmentioning

confidence: 99%

“…The average reservoir depth is approximately 5800-6000 m, and the pressure coefficient is 1.6-2.3 [8]. Thus, it is a typical high-temperature and highpressure ultradeep reservoir [1,8]. Based on the current theoretical understanding, under the complex conditions of high temperature, high pore pressure, and high tectonic stress in the deep reservoir, rock mechanical properties are different from those of shallow formations to some extent [9,10].…”

Section: Introductionmentioning

confidence: 99%

Rock Mechanical Properties and Breakdown Pressure of High-Temperature and High-Pressure Reservoirs in the Southern Margin of Junggar Basin

Kong¹,

Zhang

Zhao³

et al. 2021

Geofluids

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The mechanical properties of the high-temperature and high-pressure reservoirs in the southern margin of Junggar Basin have not been clearly understood, which correspondingly results in uncertainties when predicting the breakdown pressure. To address this issue, firstly, rock mechanical experiments under high temperature, high confining pressure, and high pore pressure were carried out. Secondly, empirical formulas related to the transformation of dynamic and static mechanical parameters in the regional strata were proposed. Finally, the existing prediction model for the formation breakdown pressure was improved by taking the wellbore seepage and thermal stress into consideration. Results show that under the reservoir condition of high temperature and high pressure, the rock sample tends to form closed shear cracks. High temperature causes thermal damages and the reduction of the compressive strength and elastic modulus, while the combined effects of high confining pressure and pore pressure enhance the compressive strength and plasticity of the rock sample simultaneously. Based on the correlation analysis, it is found that the static elastic modulus is linearly related to the dynamic value, while static Poisson’s ratio is a quadratic function of the dynamic value. These fitting functions can be used to obtain the profiles of static elastic modulus and Poisson’s ratio based on their dynamic values from the logging interpretation. Besides, the improved prediction model for the rock breakdown pressure can yield more accurate results indicated by the error less than 2%. Therefore, the proposed breakdown pressure prediction model in this study can provide theoretical guidance in the selection of fracturing truck groups and the design of the pumping schedule for high-temperature and high-pressure reservoirs.

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Characteristics and Controlling Factors of Deep Buried Reservoir in the Southern Margin of Junggar Basin

Cited by 2 publications

References 0 publications

Lithologic Hydrocarbon Accumulations in the Upper Jurassic Kalazha Formation in the Foreland Slope, the South Marginal Junggar Basin, Northwest China

Lithologic Hydrocarbon Accumulations in the Upper Jurassic Kalazha Formation in the Foreland Slope, the South Marginal Junggar Basin, Northwest China

Rock Mechanical Properties and Breakdown Pressure of High-Temperature and High-Pressure Reservoirs in the Southern Margin of Junggar Basin

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