Origin and accumulation mechanisms of deep paleozoic oil and gas: A case study of the central Tarim basin, western China

Li, Mingpeng; Chen, Zhonghong; Yi, Shiwei; Lin, Senhu; Gao, Yang; Fu-xi, Huang; She, Yuanqi; Qiao, Rongzhen

doi:10.1016/j.petrol.2021.109634

Cited by 12 publications

(3 citation statements)

References 32 publications

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“…Some scholars have measured the organic matter abundances of the source rocks in the Lower Cambrian in the Tabei uplift and have reported contents of 7-14% and up to 22.39% in local regions (Table 1) [19,33]. The exploration activities have demonstrated that the Cambrian oil and gas in the Tarim Basin mainly came from the Lower Cambrian source rocks [20,29,34], but few studies have been conducted on the thermal evolution characteristics of the source rocks in the interplatform basin. Regional studies have revealed that a set of shale deposits was developed on the deep-water shelf and slope in the Lower Cambrian [35].…”

Section: Current Exploration Situationmentioning

confidence: 99%

Secondary Migration Trend Based on Basin Modeling: A Case Study of the Cambrian Petroleum System in the Tarim Basin

Yue

Wei

et al. 2023

Geofluids

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Secondary hydrocarbon migration is an important aspect of oil-gas accumulation research. While previous studies have relied on geological and fluid geochemical characteristics to predict migration direction, these results are often limited by the number of samples. In recent years, basin simulation has emerged as a valuable tool in hydrocarbon migration research due to its extensive algorithms and adaptable modeling capabilities. It has obvious technical advantages especially for resource evaluation in areas with a lower exploration degree and scarce data. The deep oil and gas in the Cambrian petroleum system in the Tarim Basin is a deep hydrocarbon challenging area in China. There has been no breakthrough in exploration due to the large burial depth ( generally > 6000 m ) and the long accumulation and transformation processes. Therefore, predicting the secondary migration of Cambrian oil and gas has become the key to solving this problem. In this study, first, the thermal evolution of the Lower Cambrian source rocks in the Tarim Basin was recovered, and the three thermal evolution models were developed. The secondary migration process of the Cambrian petroleum system was restored using the geologic model of the source rocks and paleotectonic evolution and the latest fluid potential information. By comparing the simulation results, four secondary migration models of the ultradeep oil-gas migration and accumulation were developed: multisource, multiphase, multidirectional accumulation; multisource, multiphase, single-directional accumulation; single-source, multiphase, multidirectional accumulation; and single-source, multiphase, single-directional accumulation. The fluid potential simulation results indicate that the Cambrian oil and gas have salient inheritance characteristics. The dominant migration channels in the uplift and slope are beneficial to oil-gas migration and accumulation, and the Katake uplift and the west Bachu uplift have multisource charging accumulation. The east Bachu uplift and the Tabei uplift are oil-gas accumulation zones that are beneficial to the lower petroleum system due to the continuous charging of a single petroleum system. This fluid potential simulation provides a new solution for studying the secondary migration of deep oil and gas. It provides an important reference for studying hydrocarbon accumulation in deep and ultradeep areas.

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Section: Current Exploration Situationmentioning

confidence: 99%

Secondary Migration Trend Based on Basin Modeling: A Case Study of the Cambrian Petroleum System in the Tarim Basin

Yue

Wei

et al. 2023

Geofluids

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“…Up to now, most of the oil and gas resources are developed from the shallow rock formations [1] . With the rapid consumption of energy, the oilwell drilling techniques are toward to the deep and ultra-deep formations [2,3] , which increases the need of drilling techniques and equipment for the deep formation. Drill bit is one of the most important downhole tools used to generate a wellbore [4,5] .…”

Section: Introductionmentioning

confidence: 99%

Numerical studies on rock breaking of single axe-shaped PDC cutter

Yao¹,

Zhang²,

Liu³

2023

J. Phys.: Conf. Ser.

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For a drill bit, the cutter is the most important part to break the rock. In oilwell drilling, polycrystalline diamond compact (PDC) bit is widely used to shear the rock formation. In this paper, a finite element model with including the axe-shaped PDC cutter and rock formation is developed to study the rock breaking behaviours. Results show that the effect of axe-shaped PDC cutter on rock breaking is better than that of the planar PDC cutter. The front rake angle and face angel play significant role on the axial force but have little influence on the tangential force. In addition, both the tangential force and axial force increase rapidly with increasing the depth of cut.

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“…However, these processes often led to increased uncertainty (Table ). Compared with sandstone, carbonate rocks are usually porous media − and exhibit more complex characteristics, and the reservoir storage space is composed of pores, caves, and fractures of different sizes, showing strong heterogeneity. − The study of DLOAs presents great challenges for oil accumulation in deep carbonate rocks.…”

Section: Introductionmentioning

confidence: 99%

Critical Condition of the Depth Limit of Oil Accumulation of Carbonate Reservoirs and Its Exploration Significance in the Lower Ordovician of the Tazhong Area in the Tarim Basin

Wang,

Pang,

Wang

et al. 2023

ACS Omega

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Carbonate rocks typically constitute porous media, making the study of hydrocarbon accumulation in carbonate reservoirs an essential area of research. In the Tazhong area of the Tarim Basin, specifically within the Lower Ordovician stratum exceeding 7000 m, effective reservoirs and industrial liquid hydrocarbon accumulations persist. However, the existence of a depth limit of oil accumulation (DLOA) for oil accumulation in carbonate reservoirs remains unclear, posing a challenge for explorers. This study quantitatively characterizes the critical condition of DLOA in deep carbonate reservoirs from the perspective of hydrocarbon accumulation dynamics. Through comprehensive experimental analysis, statistical assessments, and numerical simulations, it also forecasts the potential for deep oil exploration. Based on the results of mercury injection experiments on 350 carbonate rock cores collected from 19 drilling wells in the deep Lower Ordovician, it was found that the reservoir is compact and exhibits significant heterogeneity. The driving force for oil accumulation is the capillary pressure difference between the surrounding rock and the reservoir. A greater capillary pressure difference indicates improved oil-bearing properties within the reservoir. When the capillary pressure difference between the reservoir and surrounding rock reaches zero, oil accumulation cannot occur, marking the critical condition of DLOA. The critical pore throat radius for DLOA in the deep Lower Ordovician carbonate rocks in the Tazhong area of the Tarim Basin is determined to be 0.01 μm, and the DLOA is estimated at 9000 m. This study confirms that the maximum depth for the embedded Lower Ordovician carbonate reservoir in the Tazhong area does not surpass this limit. Consequently, oil exploration in deep carbonate rocks within this stratum is both feasible and promising. The findings from this study hold significant importance in scientifically predicting favorable areas for oil exploitation in deep layers and offer valuable insights into understanding the oil flow in carbonate rocks.

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Origin and accumulation mechanisms of deep paleozoic oil and gas: A case study of the central Tarim basin, western China

Cited by 12 publications

References 32 publications

Secondary Migration Trend Based on Basin Modeling: A Case Study of the Cambrian Petroleum System in the Tarim Basin

Secondary Migration Trend Based on Basin Modeling: A Case Study of the Cambrian Petroleum System in the Tarim Basin

Numerical studies on rock breaking of single axe-shaped PDC cutter

Critical Condition of the Depth Limit of Oil Accumulation of Carbonate Reservoirs and Its Exploration Significance in the Lower Ordovician of the Tazhong Area in the Tarim Basin

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