Integrated geological-geophysical characterizations of deeply buried fractured-vuggy carbonate reservoirs in Ordovician strata, Tarim Basin

Tian, Fei; Luo, Xiaorong; Zhang, Wang

doi:10.1016/j.marpetgeo.2018.10.028

Cited by 62 publications

(24 citation statements)

References 68 publications

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“…The river connectivity in Block 3 is significantly improved and the river width is widened. Previous studies on the karst development [2,3,14,46,88] and the actual drilling process show that Well 1 and Well 2 have a certain degree of connectivity (Figure 7d), which is not shown in the clustering results of the full-band data (Figure 7b). The near-shore karst platform and gentle karst slopes of the ancient channel were formed by strong hydrodynamic erosion, which can easily form a pipeline system "crossing the mountain".…”

Section: Characterization Of the Reservoir Distribution By A Waveformmentioning

confidence: 74%

“…The general characteristics of karst systems have been extensively published, and modern cave systems are well-studied [89][90][91][92][93][94][95]. The distribution of fracture-cavity channel systems formed by the action of paleo-karst water can be divided into network, dendritic, pinnate, single-pipe, individual, and other forms [88]. The karst platforms and gentle karst slopes near the ancient rivers are strongly hydro-dynamically eroded, forming karst landforms with a low degree of late filling and damage, and large reservoirs have formed around the karst landforms.…”

Section: Geological and Geophysical Interpretation Of The Reservoirmentioning

confidence: 99%

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Spectral Decomposition and a Waveform Cluster to Characterize Strongly Heterogeneous Paleokarst Reservoirs in the Tarim Basin, China

Shan

Tian

Fang

et al. 2019

Water

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The main components of the Ordovician carbonate reservoirs in the Tahe Oilfield are paleokarst fracture-cavity paleo-channel systems formed by karstification. Detailed characterization of these paleokarst reservoirs is challenging because of heterogeneities in characteristics and strong vertical and lateral non-uniformities. Traditional seismic analysis methods are not able to solve the identification problem of such strongly heterogeneous reservoirs. Recent developments in seismic interpretation have heightened the need to describe the fracture-cavity structure of a paleo-channel with more accuracy. We propose a new prediction model for fracture-cavity carbonate reservoirs based on spectral decomposition and a waveform cluster. By the Matching Pursuit decomposition algorithm, the single-frequency data volumes are obtained. The specific frequency data volume that is the most sensitive to the reservoir is chosen based on seismic synthesis traces of well-logging data and geological interpretability. The waveform cluster is then applied to delineate the complex paleokarst systems, particularly the fracture-caves in the runoff zone. This method was applied to the area around Well T615 in the Tahe oilfield, and a paleokarst fracture-cavity system with strong heterogeneity in the runoff zone was delineated and characterized. The findings of this research provide insights for predicting other similar karst systems, such as karstic groundwater and karst hydrogeological systems.

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Section: Characterization Of the Reservoir Distribution By A Waveformmentioning

confidence: 74%

Section: Geological and Geophysical Interpretation Of The Reservoirmentioning

confidence: 99%

Spectral Decomposition and a Waveform Cluster to Characterize Strongly Heterogeneous Paleokarst Reservoirs in the Tarim Basin, China

Shan

Tian

Fang

et al. 2019

Water

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“…As most production strata in China are terrestrial petroliferous basins, marine petroliferous basins are relatively few in China. The Tahe Oilfield is the largest marine sedimentary strata oilfield in China, with an area of about 750 km 2 [10,31]. Its geographical location is on the southern edge of the Tianshan Mountains and the northern edge of Taklimakan Desert (Figure 1), and the administrative division is located in Kuche and Luntai County, Xinjiang Uygur Autonomous Region [34][35][36].…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Sayago et al, on the other hand, used the multiple seismic attribute classification method to characterize a paleokarst system of the Loppa highlands [30]. Tian et al used an acoustic impedance inversion dataset to identify the heterogeneity of a paleokarst system in Tarim Basin [10,31].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Geophysical Characterization of Deeply Buried Paleokarst System in the Tahe Oilfield, Tarim Basin, China

Tian

Wang

Fang

et al. 2019

Water

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Paleokarst reservoirs are the major type of the Ordovician carbonate reservoirs in the Tahe Oilfield. Due to the strong heterogeneity in distribution, it is a real challenge to detect the spatial distribution of paleokarst reservoirs, especially those deeply buried more than 5500 m in the Tahe area. Based on the abundant core samples, this paper first described the structure of paleocaves drilled by well. Second, after time–depth conversions, the results from drilled wells were tied to three-dimensional (3D) seismic datasets, and then the threshold of host rocks and caves in wave impedance were identified. Third, the seismic-scale mapping and visualization of the paleokarst reservoirs were achieved by tracing the distribution of paleocaves. This approach was applied in the well T403 area, and the structure of the paleokarst, especially the runoff zone, was interpreted. 3D structure and spatial distribution of the paleokarst system was demonstrated by plane, vertical, and 3D models. Additionally, according to the hydrology genetic relationships, the paleocaves in the runoff zone were divided into sinkholes, main channel, and branch channel. The approach of a 3D geophysical characterization of a deeply buried paleokarst system can be applicable to Tahe and other similar paleokarst oilfields, which will guide hydrocarbon exploration in paleokarst reservoirs.

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“…Global hydrocarbon resources stored in different types of carbonate rocks are particularly abundant, and the proven recoverable reserves are up to 1.8 trillion barrels, which play a very significant role in energy supply 1 . To our best of knowledge, The carbonate reservoirs can be mainly divided into three categories: porous type, fractured-porous type and fractured- vuggy type 2–7 . In recent years, China has made several great breakthroughs to effective development of fractured-vuggy Carbonate reservoirs, e.g., Tahe and Tarim oilfields 8 .…”

Section: Introductionmentioning

confidence: 99%

Oil recovery for fractured-vuggy carbonate reservoirs by cyclic water huff and puff: performance analysis and prediction

Wang

Sun

2019

Sci Rep

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Cyclic water huff and puff (CWHP) has proven to be an attractive alternative to improve oil production performance after depletion-drive recovery in fractured-vuggy carbonate reservoirs. However, due to the impact of strong heterogeneity, multiple types of fractured-vuggy medium, poor connectivity, complex flow behaviors and oil-water relationship, CWHP is merely suitable for specific types of natural fractured-vuggy medium, usually causing a great difference in actual oil-yielding effect. It remains a great challenge for accurate evaluation of CWHP adaptability and quantitative prediction of production performance in fractured-vuggy carbonate reservoir, which severely restricts the application of CWHP. For this study, we firstly enable the newly developed fuzzy grey relational analysis to quantify the adaptability of CWHP. With production history of several targeted producers, the accuracy of the proposed method is validated. Based on the traditional percolation theory and waterflood mechanisms in various types of fractured-vuggy medium, a quantitative prediction model for cyclic water cut fwp and increased recovery factor ΔR is presented. The CWHP production performance is discussed by using the Levenberg-Marquardt algorithm for history matching. With a better understanding of the fwp ~ ΔR curve characteristics in different types of fractured-vuggy medium, proper strategies or measures for potential-tapping remaining oil are provided. This methodology can also offer a good basis for engineers and geologists to develop other similar reservoirs with high efficiency.

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Integrated geological-geophysical characterizations of deeply buried fractured-vuggy carbonate reservoirs in Ordovician strata, Tarim Basin

Cited by 62 publications

References 68 publications

Spectral Decomposition and a Waveform Cluster to Characterize Strongly Heterogeneous Paleokarst Reservoirs in the Tarim Basin, China

Spectral Decomposition and a Waveform Cluster to Characterize Strongly Heterogeneous Paleokarst Reservoirs in the Tarim Basin, China

Three-Dimensional Geophysical Characterization of Deeply Buried Paleokarst System in the Tahe Oilfield, Tarim Basin, China

Oil recovery for fractured-vuggy carbonate reservoirs by cyclic water huff and puff: performance analysis and prediction

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