Carbonate‐reservoirs prediction strategy and technologies in Tarim Basin of China

Yang, Peng; Liu, Yonglei; Hou, Yunpeng; Huiqing, Jia; Dong, Liang; Li, Haiying

doi:10.1190/1.2793035

Cited by 5 publications

(6 citation statements)

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“…8B,C). Because a great majority of research (Ping et al 2007;Sun et al 2011a;Zhang et al 2011a,b) suggested that the karstic reservoir in this area typically shows a lower PI value compared to compacted carbonate matrix, the gas reservoir should exhibit lower PI and Sw (water saturation) values, opposite of water-saturated reservoirs. The predicted fluid is consistent with this character and verifies this fluid identification method.…”

Section: Resultsmentioning

confidence: 98%

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Fluid mapping in deeply buried Ordovician paleokarst reservoirs in the Tarim Basin, western China

et al. 2015

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The storage spaces within deeply buried Ordovician paleokarst reservoirs in the Tarim Basin are mostly secondary and characterized by strong heterogeneity and some degree of anisotropy. The types of fluids that fill the spaces within these reservoirs are of great importance for hydrocarbon exploration and exploitation. However, fluid identification from seismic data is often controversial in this area because the seismic velocity for this particular reservoir could be significantly influenced by many factors, including pore shapes, porosity, fluid types, and mineral contents. In this study, we employ the differential effective medium-Gassmann rock physics model to interpret and discuss the characteristics of conventional karstic carbonate reservoirs in the Tarim Basin that are filled with different fluids (oil, gas, and water) using logging data and thus objectively build corresponding fluid identification criteria. These criteria are subsequently evaluated by amplitude versus offset (AVO) forward analysis based on typical logging data and further applied to ascertain the reservoir fluid types in two different areas in the Tarim Basin based on prestack inversion results. For conventional carbonate reservoirs, gas can be distinguished from heavy oil and water, but heavy oil and water are broadly similar on seismic data. For condensate carbonate reservoirs, water can be differentiated from light oil (i.e., condensates) and gas, but light oil and gas demonstrate substantial similarities in terms of their seismic responses. The predicted fluid results are in good agreement with the results of drilling and oil testing. In particular, modeling the seismically resolvable reservoirs in the carbonate strata in the Tarim Basin, which have needle-and sphere-shaped storage spaces (pore aspect ratio > 0.3) and clay content that is lower than 5%, indicates that fluid properties could be properly evaluated if the porosity is larger than 5% for conventional carbonate reservoirs and >7% for condensate carbonate reservoirs.

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Section: Resultsmentioning

confidence: 98%

“…In the Tarim Basin in western China, Ordovician karst plays actively produce hydrocarbons and are the target of an ongoing exploration effort by the Tarim Oilfield Company (Ping et al 2007). This complex basin contains a number of uplifts and depressions ( Fig.…”

Section: Background Geologymentioning

confidence: 99%

Fluid mapping in deeply buried Ordovician paleokarst reservoirs in the Tarim Basin, western China

et al. 2015

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“…As the inverted impedance has not only eliminated the wavelet influence but also added the drilling information in the initial earth model, it is widely suggested to be better correlated with the reservoir quality than seismic amplitude , Ping et al 2007). We conduct the impedance inversion for both the full-stack and www.ccsenet.org/esr Earth Science Research Vol.…”

Section: Comparison On Field Datamentioning

confidence: 99%

“…In the Tarim Basin in Western China, the Ordovician karst play is actively producing hydrocarbons and reserves approximately 72.84% of the whole hydrocarbon resources (Ping et al, 2007). With two strong tectonic movements during the Early and Late Paleozoic, the Ordovician carbonate rocks experienced strong weathering and erosion and formed a karst reservoir, which is overburdened by Carboniferous and Triassic clastic rock.…”

Section: Introductionmentioning

confidence: 99%

The Comparison between Full-Stack Data and Pure P-Wave Data on Deeply Buried Ordovician Paleokarst Reservoir Prediction

Zhang¹,

Sun²,

Jin³

et al. 2016

ESR

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The present burial depth of the paleokarst reservoirs in the Tarim Basin is greater than 5000m, which premises rigorous demands for the data quality for accurate predictions. Although routinely used for reservoir prediction, the conventional full-stack data are often contaminated by the AVO (amplitude versus offset) effects no matter how much signal to noise ratio degree can be enhanced via stacking. This contamination usually changes with different geological deposits, and could reach an inappropriate and unacceptable level for the deeply buried carbonate reservoir in the Tarim Basin. In this paper, the pure P-wave data theoretically inverted through AVO effects removal are employed to improve reservoir prediction, which are illustrated by the comparisons with that of the conventional full-stack data for the classical four AVO models and the field data in the ZG8 area, Tazhong Uplift, central Tarim Basin. The dominant frequency has been improved for 8 Hz from 15 to 23 Hz in the target Yingshan formation, Ordovician through AVO effects removal, and the reflection events of the pure P-wave data are obviously more continuous comparing with that of the full-stack data. The fake potential reservoir caused by AVO effects in the northeast area has been removed, while the integral delineation of paleokarst reservoirs have been significantly improved with a higher fitness with the oil-testing results, which are more beneficial for later on exploration. The pure P-wave data inversion is in essence an important complement to current processing strategy.

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“…On the contrary, a more reasonable AI LFM considerably preserved the heterogeneous reservoir information (Figure 7b) has been successfully constructed by the proposed amplitude-based method. As the inverted impedance has not only eliminated the wavelet influence but also added the drilling information in the initial earth model, it is widely suggested to be better correlated with the reservoir quality than the seismic amplitude (Zhang et al, 2011a;Yang et al, 2007). We conduct the impedance inversion based on two different LFMs respectively constructed from the traditional and proposed methods.…”

Section: Applicationmentioning

confidence: 99%

An Amplitude-Based Modeling Method and its Application on the Impedance Inversion in Heterogeneous Paleokarst Carbonate Reservoirs

Zhang¹,

Sun²,

Jin³

et al. 2016

ESR

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For the modeling of complex reservoirs with strong heterogeneity, for instance the deeply buried paleokarst reservoirs in the Tarim Basin, the traditional method by lateral interpolation and extrapolation of measured logs between well locations with the guiding of interpreted seismic horizons is driven by distance and often leads to non-geologic solutions, while the past improvements via adding seismic velocities or attributes information are still not accurate due to the resolution limitation or AVO (amplitude versus offset) effects contamination. In this paper, we present an amplitude-based modeling method by utilizing the heterogeneous information from seismic data to guide the geological model construction, based on the inverted pure P-wave data which have removed the AVO effects. The proposed method is applied in the impedance inversion of the paleokarst carbonate reservoirs in the Tarim Basin, where the reservoirs are characterized by substantial heterogeneity. Both the constructed Low frequency model (LFM) and the inverted impedance results of proposed method are more correlative with drilling data than that of traditional method. This method is more beneficial for strong heterogeneous reservoirs description especially in well insufficient or absent areas, suggested by the comparisons with traditional methods in the ZG8 area.

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Carbonate‐reservoirs prediction strategy and technologies in Tarim Basin of China

Cited by 5 publications

References 1 publication

Fluid mapping in deeply buried Ordovician paleokarst reservoirs in the Tarim Basin, western China

Fluid mapping in deeply buried Ordovician paleokarst reservoirs in the Tarim Basin, western China

The Comparison between Full-Stack Data and Pure P-Wave Data on Deeply Buried Ordovician Paleokarst Reservoir Prediction

An Amplitude-Based Modeling Method and its Application on the Impedance Inversion in Heterogeneous Paleokarst Carbonate Reservoirs

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