Reservoir geological modeling and significance of Cambrian Xiaoerblak Formation in Keping outcrop area, Tarim Basin, NW China

Zheng, Jianfeng; Pan, Wenqing; Shen, Anjiang; Wen-fang, Yuan; Huang, Lili; Ni, Xinfeng; Zhu, Yongjin

doi:10.1016/s1876-3804(20)60071-4

Cited by 25 publications

(5 citation statements)

References 11 publications

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“…Structurally, the study area is a part of the eastern segment of Kalpin fault-uplift zone in the North Tarim Uplift [26,27], and has a complete Ediacaran outcrop (Figure 1c). The Sugetbrak Formation is in conformable contact with the Chigbrak Formation (Figure 2a), the Lower Cambrian Yurtus Formation has a parallel unconformable contact with the Chigbrak Formation (Figure 2b) and the Scholbrak Formation is in conformable contact with the Yurtus and Usugar Formations [28]. In Aksu outcrop area, the Chigbrak Formation is about 173.5 m thick, and divided into four members from bottom to top according to color, lithology and sedimentary structure (Figure 3).…”

Section: Geological Settingmentioning

confidence: 99%

Genesis of Dolomite Reservoir in Ediacaran Chigbrak Formation of Tarim Basin, NW China: Evidence from U–Pb Dating, Isotope and Element Geochemistry

et al. 2023

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The Chigbrak Formation in the Upper Ediacaran is one of the important exploration targets in the Tarim Basin, NW China. However, no significant discoveries have been made in this field, and unclear reservoir genesis is one of the important factors restricting exploration breakthrough. This study examined the outcrops of the Aksu area in northwestern Tarim Basin by using systematic descriptions of petrologic features in the Upper Ediacaran Chigbrak Formation. Samples were selected for tests of stable carbon and oxygen isotopic compositions, strontium isotopic compositions, rare earth elements, LA–ICP–MS element mapping and U–Pb dating. It was found that (1) the Chigbrak Formation is mainly composed of dolomitic microbialite, with average values of δ13C (PDB), δ18O (PDB) and 87Sr/86Sr of 3.50‰, 2.95‰ and 0.709457, and has similar geochemical characteristics to the coeval seawater. The dolomites have also been characterized by a medium degree of cation ordering (avg. 0.68), a low content of ΣREEs (avg. 9.03 ppm) and a chondrite standardized curve of REEs showing enrichment of LREE and depletion of HREE. The U–Pb ages range from 538 to 618 Ma, corresponding to the age of Ediacaran period. (2) Dolomitization occurred in a marine diagenetic environment during the penecontemporaneous period, with seawater as the dolomitization fluid. (3) Vugs are the dominant pore type of Chigbrak Formation, and they are the products of the dissolution of meteoric water in penecontemporaneous period. (4) The main controlling factors of reservoir were lithofacies, meteoric water dissolution controlled by fourth– or fifth–order sequences and tectonic movement, and early dolomitization. The research results are of great significance to the dolomite reservoir prediction of the Upper Ediacaran Chigbrak Formation of the Tarim Basin.

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Section: Geological Settingmentioning

confidence: 99%

Genesis of Dolomite Reservoir in Ediacaran Chigbrak Formation of Tarim Basin, NW China: Evidence from U–Pb Dating, Isotope and Element Geochemistry

et al. 2023

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“…The current methods for analyzing water content include water content gray GM (1,1) model, logistic cycle model, generalized usher model, and five models that characterize the relationship between water content and recovery degree (concave type, concave-S transition type, S type, S-convex transition type, and convex type). The main controlling factors affecting the rise of water cut are reservoir heterogeneity and the difference in water absorption status of water wells [28]. The main factors affecting the change law of water cut in low permeability oilfields are fluid properties (oil-water viscosity ratio) and reservoir physical properties (permeability, starting pressure).…”

Section: ) Evaluation Of Water Injection Development Effectmentioning

confidence: 99%

Fine Geological Modeling of Complex Fault Block Reservoir Based on Deep Learning

Liu

Zhang

et al. 2022

Wireless Communications and Mobile Computing

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Nowadays, people’s demand for underground mineral resources is increasing, and geological disasters have occurred frequently in recent years. Geological disasters refer to geological effects or geological phenomena that are formed under the action of natural or man-made factors, causing loss of human life and property, and damage to the environment; such as landslides, collapses, mudslides, and ground subsidence. Under such a background, people must accelerate the exploration of complex geological structures. This paper is aimed at using the methods and concepts of deep reinforcement learning. Deep learning is to learn the inherent laws and representation levels of sample data. The information obtained during these learning processes is of great help to the interpretation of data such as text and images. In this way, the fine geology of complex fault-block reservoirs is modeled and studied. Geological structures and phenomena are discussed through convolutional neural network models and computer techniques. At the same time, the multitask bird recognition network is used to extract and classify geological images, so as to construct geological model maps with different spatial structures. Finally, the quality of the fault reconstruction model, the calculation of reservoir geological simulation reserves, and the evaluation of the water injection development effect of complex fault blocks are analyzed. In the evaluation of the development effect of water injection in complex fault blocks, comparing the relationship curve between the actual comprehensive water content and the oil recovery factor with the standard curve, the comprehensive water content of the initial block increased rapidly. Through timely and dynamic water allocation and comprehensive management, the water cut rising speed is controlled. The current comprehensive water cut of the reservoir is between 60% and 80%, the actual curve is between 25% and 35%, and the estimated waterflooding recovery is about 30%.

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“…Economic interest has driven increased research into the sedimentary facies of the Early Cambrian Xiaoerbulake Formation in the Tarim Basin. Researchers have proposed that the Xiaoerbulake Formation belongs to the sedimentary facies zone of ramp, ramptidal flat, restricted platform, semi-evaporative platform, open platform margin or slopebasin [14,[18][19][20][21]. However, previous studies mainly focused on limited well logging and cutting data and low-resolution 2D and 3D seismic data, but did not thoroughly address with the facies and facies associations of the Early Cambrian Xiaoerbulake Formation carbonate ramp.…”

Section: Introductionmentioning

confidence: 99%

Facies, Depositional Environment and Reservoir Quality of an Early Cambrian Carbonate Ramp in the Tarim Basin, NW China

Zhu¹,

Zheng²,

Zhang

et al. 2023

Minerals

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The Xiaoerbulake Formation in the Tarim Basin is considered one of the most important deep to ultradeep hydrocarbon reservoirs in the world. The objective of the present study is to analyze the facies, depositional environment and reservoir quality of the Early Cambrian Xiaoerbulake Formation in the Tarim Basin through integrated analysis of 120 m of cores, 3240 m of well cuttings, wireline logs and over 1100 thin sections from 17 exploration wells. Early Cambrian Xiaoerbulake Formation deposits in the Tarim Basin were deposited on a ramp setting. The ramp was occupied by seven facies associations and ten facies types ranging from the inner ramp to the outer ramp. These facies associations include tidal flat, lagoon, high-energy shoal, sabkha, inter-shoal, low-energy shoal and open shelf. Their distribution was controlled by paleogeographic patterns, sea level changes and the paleoclimate. Reservoir quality is considerably affected by facies together with diagenetic processes, including dolomitization and anhydrite cementation. High-quality reservoirs are found in the dolograinstone of high-energy shoal environments, which are favorable exploration facies in the carbonate ramp. Their pore space types consist of interparticle pores, intraparticle pores, intercrystalline pores, vuggy pores and moldic pores, with a porosity of 1.4%–7.5%. This study will help with our understanding of the stratigraphic framework, sedimentary-facies evolution and high-quality reservoir distribution of the Early Cambrian carbonate ramp in the Tarim Basin, facilitating exploration and the production of hydrocarbons from the Xiaoerbulake Formation.

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Reservoir geological modeling and significance of Cambrian Xiaoerblak Formation in Keping outcrop area, Tarim Basin, NW China

Cited by 25 publications

References 11 publications

Genesis of Dolomite Reservoir in Ediacaran Chigbrak Formation of Tarim Basin, NW China: Evidence from U–Pb Dating, Isotope and Element Geochemistry

Genesis of Dolomite Reservoir in Ediacaran Chigbrak Formation of Tarim Basin, NW China: Evidence from U–Pb Dating, Isotope and Element Geochemistry

Fine Geological Modeling of Complex Fault Block Reservoir Based on Deep Learning

Facies, Depositional Environment and Reservoir Quality of an Early Cambrian Carbonate Ramp in the Tarim Basin, NW China

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