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Efficient wavefield separation by reformulation of two-way wave-equation depth-extrapolation scheme
Water Abundance Comprehensive Evaluation of Coal Mine Aquifer Based on Projection Pursuit Model
Petrogenesis of (meta-) basalts from the North Qilian Orogenic Belt, NW China: implications for the Palaeoproterozoic–Mesoproterozoic tectonic evolution of the North Qilian Block
Hydromechanical-Coupled Cohesive Interface Simulation of Complex Fracture Network Induced by Hydrofracturing with Low-Viscosity Supercritical CO 2
Petrogenesis of Silurian ultramafic–mafic plutons in southern Jiangxi: implications for the Wuyi–Yunkai orogen, South China
K-bentonites in Ordovician–Silurian transition from South China: implications for tectonic evolution in the northern margin of Gondwana
Rescue Work and Progress of Analog Seismograms in China
Thrusting, exhumation, and basin fill on the western margin of the South China block during the India-Asia collision
Seismic impedance inversion using dictionary learning-based sparse representation and nonlocal similarity
Authigenic origin for a massive negative carbon isotope excursion
Diagenesis and its impact on a microbially derived carbonate reservoir from the Middle Triassic Leikoupo Formation, Sichuan Basin, China
A New Strategy of Finite‐Fault Inversion Using Multiscale Waveforms and Its Application to the 2015 Gorkha, Nepal, Earthquake
Stabilities of iodide and iodate for iodine speciation analysis in soils
A two-layer model for the intrusion of two-phase debris flow into a river
Applying principal component analysis to seismic attributes for interpretation of evaporite facies: Lower Triassic Jialingjiang Formation, Sichuan Basin, China
Pore characteristics of lacustrine mudstones from the Cretaceous Qingshankou Formation, Songliao Basin
Possible biogenic structures from the Lower Cambrian strata in Yunnan Province, South China
PETROGRAPHY AND GEOCHEMISTRY OF THE LOWER-MIDDLE ORDOVICIAN DOLOMITES IN NORTHWESTERN TAZHONG UPLIFT, TARIM BASIN, CHINA
Abstract The Lower-Middle Ordovician carbonate reservoirs have been recognized as the most important strata in terms of oil and gas exploration in NW Tazhong Uplift, Tarim Basin, China. Intercrystalline porosity, vugs, and fractures were preferentially developed in the dolostone intervals, and understanding the processes of dolomitization is therefore crucial for the prediction of the connectivity and spatial distribution of reservoir quality. Two major types of replacement dolomite (RD1 and RD2) were identified based on fabrics and textures: RD1 dolomite is light gray in hand specimen with porous sucrosic texture and partially preserved precursor lithologic texture. Microscopically, it consists of fine- to medium-crystalline (50-250 μm), euhedral to subhedral dolomite crystals with planar crystalline boundaries. RD1 dolomite has δ 18 O values between −7.0 and −3.2‰ relative to Vienna Peedee belemnite (VPDB; mean −5.9‰ VPDB), either similar to, or slightly higher than, values estimated from Early-Middle Ordovician marine dolomite. The δ 13 C values (−1.9 to −0.1‰ VPDB, mean −0.6‰ VPDB) and 87 Sr/ 86 Sr ratios (0.708021-0.708526, mean 0.708351) of RD1 dolomites fall within the range of coeval seawater values. These features suggest that RD1 probably formed from the reflux of slightly evaporitic (penesaline) seawater that did not reach the salinity required for gypsum precipitation during early diagenesis. RD2 dolomite is dark gray in cores, with the precursor texture completely obliterated. RD2 is microscopically composed of medium- to coarse-crystalline (150-500 μm), subhedral to anhedral crystals with nonplanar/irregular crystalline boundaries and weak undulatory extinction. This dolomite lacks intercrystalline porosity, but vugs and fractures are locally developed and partially filled by minor amounts of saddle dolomite cements, late-stage calcite cements, and fluorite. RD2 dolomite yields depleted oxygen isotopic compositions (−10.7 to −7.0‰, mean −9.1‰ VPDB), indicating that the dolomite formed at elevated temperatures during intermediate to deep burial. Sr isotopes analyses show that the dolomitizing fluids with respect to RD2 dolomite were mainly derived from connate seawater preserved in the Lower-Middle Ordovician carbonate formations. The lower Sr isotopic values (0.707193-0.707723) of some RD2 dolomites suggest mixing of small amounts of hydrothermal fluids derived from basic magmatic fluids that had lower 87 Sr/ 86 Sr ratios, whereas more radiogenic 87 Sr/ 86 Sr ratios (0.709028-0.714287) in RD2 dolomites might have resulted from burial recrystallization and/or were associated with dolomitizing fluids passing through the deeper Precambrian clastic rocks and basement.