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Abstract

Rock physics provides a good theoretical tool and understanding of the connection between the elastic parameters and the physical properties of reservoir rocks; therefore, a relationship and a link between physical rock properties and seismic expressions can be established. This study aims to utilize rock physics and AVO theoretical tools to better determine and characterize hydrocarbon-bearing zones at a newly drilled “Well-A” in Diyarbakir Basin in the southeastern Turkey. “Well-A” is located at 10 km in distance to major producing oil fields targeting limestones of Dadas Formation and sandstones of Bedinan Formations. In the vicinity of Well-A, two exploration wells were drilled before and completed as “dry well” with minor oil and gas shows. In the area, source rocks are the shales in Dadas Formation in Diyarbakir and northern Diyarbakir area and early Cretaceous age carbonates in Adiyaman area. Reservoir rocks are early Paleocene age Sinan and Garzan Formations, late Cretaceous age carbonates of Mardin Group’s Karababa and Derdere Formations, and sandstones of Paleozoic Bedinan and Hazro Formations. There has been 2 Drill Stem Tests (DST) conducted at wellbore. First DST was successful between the depths from 2755 to 2767 m (9038-9078 ft) and 81 stand (st) gas mud mixed condensed was recovered. Second DST was between 2863-2893 m (9393-9491 ft) and 28 st. recovery was made. At this point, rock physics and AVO studies are required to aid in the determination of hydrocarbon-bearing zones for perforation. Rock physics part of this study includes the calculation of elastic parameter logs. Lame constant (λ), Lambda-Rho, Shear Modulus (μ), Mu-Rho, Young’s Modulus (E), Poisson’s Ratio (σ), Bulk Modulus (k) were calculated and used to create crossplots to determine and evaluate hydrocarbon-bearing intervals. Lambda*Rho vs. Lambda/Mu, P-Impedance vs. Vp/ Vs, porosity vs. p-wave velocity, acoustic impedance vs. elastic impedance (at 30 degrees) and Vp vs. Vs crossplots were generated and examine to determine possible reservoir intervals. Specific focus has been put on Young’s Modulus (E) and Poisson’s Ratio (σ) to determine brittle and ductile zones for a future fracking operation. Shear-wave sonic log measurement plays a crucial role in the calculation of elastic parameter logs since all the equations require shear-wave velocity information.

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/content/papers/10.3997/2214-4609-pdb.380.4
2013-05-15
2021-10-16
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