Organic-rich source rock characterization and evaluation of the Cretaceous Qingshankou Formation: results from geophysical logs of the second scientific drilling borehole in the Songliao Basin, NE China

Zhang, Xiaohuan; Zou, Changchun; Zhao, Jinhuan; Li, Ning; Zhang, Shuxia; Kouamelan, Kouamelan Serge; Xiao, Liang; Ma, Huolin; Niu, Yixiong

doi:10.1007/s12303-018-0013-4

Cited by 6 publications

(2 citation statements)

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“…It has low porosity and permeability, lacks a gas-water boundary, and typically has low natural production. Shale gas is found in thick shale hydrocarbon source rocks and requires fracturing for commercial gas flow [1]. Due to hydraulic fracturing, which raises the natural bulk rock permeability and makes it possible to extract trapped gas from source rocks, gas shale plays have become more significant in the last decade.…”

Section: Introductionmentioning

confidence: 99%

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Estimating Total Organic Carbon (TOC) Content and Porosity of the Ranikot Formation in the Central Indus Basin, Pakistan, Using Seismic Inversion and Well Log Analysis

Ehsan,

Zaheer,

Abbasi

2024

Journal of GeoEnergy

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An approach is proposed to improve modeling for shale gas reservoirs, integrating key parameters such as total organic carbon (TOC) and porosity. Seismic inversion uses seismic reflection data and well-log information to improve geological and geophysical interpretation and estimate rock properties with high-resolution subsurface acoustic impedance, including low and high frequencies. The Ranikot Formation in the Central Indus Basin, Pakistan, is a Paleocene-age formation with the potential to act as reservoir, seal, and source rock. The porosity of the Lower Ranikot reservoir in the Mehar Block was calculated using seismic inversion analysis with the Mehar-02 well. The petrophysical analysis yielded an effective porosity of 5.8%. Similarly, when calculated using seismic inversion, the porosity fell within the 5.5%–6.0% range. Determining the TOC content is crucial in evaluating unconventional shale resources. Petrophysical approaches, such as the ΔlogR method, offer a fast, convenient, and cost-effective means of estimating TOC from well logs. This method is commonly used in conventional source rock evaluation and applied to unconventional resource play evaluation. On the other hand, seismic inversion techniques were used to conduct TOC analysis in the absence of core data in order to estimate the source potential of the Upper Ranikot Formation. To estimate the TOC log for the Upper Ranikot shales in the Mehar Block, the Passey equation was used on the well logs of the Mehar-02 well. The estimated TOC for the Upper Ranikot shales is around 2.0%, which falls within the fair TOC range.

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Section: Introductionmentioning

confidence: 99%

“…Recent studies highlighted the importance of organic porosity and gas adsorption mechanisms within kerogen to evaluate the organic porous network in shale. The distribution of organic carbon and thermal maturity control hydrocarbons in place, including organic porosity creation and adsorption in organic matter [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%