Geostatistical Three-Dimensional Modeling of a Tight Gas Reservoir: A Case Study of Block S6 of the Sulige Gas Field, Ordos Basin, China

Zhang, Jinliang; Liu, Longlong; Wang, Ruoshan

doi:10.3390/en10091439

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…The main part of the basin is limited by the surrounding fracture, and the bulk of the basin inclines gently to the west with an angle of less than 1 • [9][10][11][12]22,23]. Besides structures including the edge fold, breakage, and bend developed around the basin, faults and anticlines are not well-developed in the basin [12,24]. On the basis of previous studies, the Ordos basin could be divided into six first-order tectonic units ( Figure 1) [25].…”

Section: Geological Settingsmentioning

confidence: 99%

Natural Gas Reservoir Characteristics and Non-Darcy Flow in Low-Permeability Sandstone Reservoir of Sulige Gas Field, Ordos Basin

et al. 2020

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In order to reveal the gas-water distribution and formation mechanism of the low-permeability sandstone gas reservoir, the gas reservoir distribution and the formation mechanism in a low-permeability sandstone gas reservoir are investigated using data obtained from a physical simulation experiment of gas percolation. The exploration and experimenting for petroleum in the upper Paleozoic gas pool of the Sulige gas field in the Ordos basin in this paper. Results showed that the gas reservoir is characterized by low gas saturation, a complex distribution relationship of gas-water, and weak gas-water gravity differentiation. The characteristics of gas distribution are closely related to permeability, gas flow, and migration force. The capillary pressure difference is the main driving force of gas accumulation. There exists a threshold pressure gradient as gas flows in low-permeability sandstone. The lower that permeability, the greater the threshold pressure gradient. When the driving force cannot overcome the threshold pressure (minimal resistance), the main means of gas migration is diffusion; when the driving force is between minimal and maximal resistance, gas migrates with non-Darcy flow; when the driving force is greater than maximal resistance, gas migrates with Darcy flow. The complex gas migration way leads to complicated gas-water distribution relationship. With the same driving force, gas saturation increases with the improvement of permeability, thus when permeability is greater than 0.15 × 10 −3 µ m 2 , gas saturation could be greater than 50%.

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Section: Geological Settingsmentioning

confidence: 99%

Natural Gas Reservoir Characteristics and Non-Darcy Flow in Low-Permeability Sandstone Reservoir of Sulige Gas Field, Ordos Basin

et al. 2020

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“…Variable range is an important parameter of variation function, representing the maximum correlation distance in space (Goovaerts, 1994;Zhang et al, 2017;Zhi et al, 2015). The larger the range, the larger the correlation scale indicating the spatial distribution of the regional variables, the slower the change rate and the less random.…”

Section: Constrained Sparse Spike Inversionmentioning

confidence: 99%

Study of Geostatistical Inversion in the Lithologic Distribution and Velocity Modeling of Thick Igneous Rock in the Fy Area, Northern Tarim Basin, China

2019

GiG

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In the northern Tarim Basin, a large number of thick igneous rocks are encountered in the drilling process in the Permian, and lithology and velocity of them are violently varying, which has great influence on migration imaging of the "beaded". It is very important to conduct the fine lithology identification and high precision velocity modeling of the igneous rocks for the exploration and development of the reservoirs.A geostatistical inversion method to obtain igneous lithologic distribution pattern and velocity modeling in the FY area of northern Tarim Basin is introduced in this paper. The results show that the application of the geostatistical inversion method greatly improves the resolution of lithology identification, which helps us further understand the Permian igneous rocks distribution in FY area. By comparing the seismic facies classification maps of FY study area, it shows that the obtained velocity model can well reflect the lateral distribution of igneous rocks. At the same time, the velocity model can also reflect the variation of igneous velocity in details and has a high precision. The average velocity error of the wells participating in the inversion is less than 2%, and the minimum average velocity error is 0.23%. At last, the velocity model is applied to seismic data processing, the processing results indicate that it can help to improve seismic migration imaging. The study demonstrates that the geostatistical inversion method can provide a highprecision velocity model for formation pressure prediction, seismic data processing and interpretation, and guide the exploration and development of oil.

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“…In recent years, many papers [17,32,[35][36][37][38][39] have been published about the Ordos Basin, China, and this area has become a hotspot. In this paper, field data are derived from the Daliuta Coal Mine (Figure 2) at Yulin city, Shanxi Province, China, which is located at 39 • 13 53"-39 • 21 32" N, 110 • 12 23"-110 • 22 54" E. The Daliuta Coal Mine lies in the north of the Loess Plateau and southeast of the Maowusu Desert, Ordos Basin, China.…”

Section: Study Areamentioning

confidence: 99%

A Novel Static Correction Approach for Eliminating the Effect of Geophones—A Case Study in Coal Reservoirs, Ordos Basin, China

Sun

2018

Energies

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Static correction is an essential step in seismic processing and it has an effect on the later steps of seismic processing, including velocity analysis, data stacking, and seismic inversion. During seismic data acquisition, a receiving point usually sets a geophone several times to receive the seismic data. The same geophone cannot be set at the same receiving point every time. If the geophones have different delay time, then the common receiving-point gather (CRG) will have multiple receiver statics. However, the receiver statics of a CRG are considered the same in conventional static correction. In this paper, based on common attitude gather (CAG), a novel static correction method is proposed to analyze the receiver statics of a CRG. Attitude indicates the tilt angles of the three components of a geophone. According to the different attitudes of geophones, CRG can be divided into multiple CAGs. When the difference technique is used to the novel method and the conventional method, the statics are analyzed with CAGs and CRGs, respectively. A field example demonstrates that the proposed method cannot only enhance the continuity of the event in the shot gather, but also smooth the gaps of the event in the CRG. The results suggest that the proposed method can eliminate the effect of differences in delay time of geophones on static correction.

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Geostatistical Three-Dimensional Modeling of a Tight Gas Reservoir: A Case Study of Block S6 of the Sulige Gas Field, Ordos Basin, China

Cited by 6 publications

References 19 publications

Natural Gas Reservoir Characteristics and Non-Darcy Flow in Low-Permeability Sandstone Reservoir of Sulige Gas Field, Ordos Basin

Natural Gas Reservoir Characteristics and Non-Darcy Flow in Low-Permeability Sandstone Reservoir of Sulige Gas Field, Ordos Basin

Study of Geostatistical Inversion in the Lithologic Distribution and Velocity Modeling of Thick Igneous Rock in the Fy Area, Northern Tarim Basin, China

A Novel Static Correction Approach for Eliminating the Effect of Geophones—A Case Study in Coal Reservoirs, Ordos Basin, China

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