Gas systems in the Kuche Depression of the Tarim Basin: Source rock distributions, generation kinetics and gas accumulation history

Zhao, Wenzhi; Zhang, Shuichang; Wang, Feiyu; Cramer, Bernhard; Chen, Jianping; Sun, Yongge; Zhang, Baomin; Zhao, Minghui

doi:10.1016/j.orggeochem.2005.08.016

Cited by 71 publications

(52 citation statements)

References 13 publications

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“…In addition, the present maturities of the Jurassic coals in the source kitchen for this gas field are very high with Ro% > 2.0 (Zhao et al, 2002;Liang et al, 2003;Zhao et al, 2005). For the three experiments in the present study, methane yields at EASY%R o 1.35 and 2.20 are about 15% and 45-47% of the maximum values for the coal samples, respectively.…”

Section: Discussionmentioning

confidence: 47%

“…Several studies of the Kela 2 gas field, the largest in the Tarim Basin, China, demonstrated that hydrocarbon gases in this field were generated from Jurassic coal source rocks at the postmature stage (R o % > 1.3, Zhao et al, 2002;Liang et al, 2003;Zhao et al, 2005). Hydrocarbon gases in this field have very high C 1 /RC 1-5 ratios ranging from 0.99-1.0, and heavy carbon isotopic composition, i.e., d…”

Section: Discussionmentioning

confidence: 94%

“…13 C values of methane and ethane in the range À26.2‰ to À28.2‰ and À16.6‰ to À19.4‰, respectively (e.g., Liang et al, 2003;Zhao et al, 2005). In addition, the present maturities of the Jurassic coals in the source kitchen for this gas field are very high with Ro% > 2.0 (Zhao et al, 2002;Liang et al, 2003;Zhao et al, 2005).…”

Section: Discussionmentioning

confidence: 94%

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Hydrocarbon generation from coal, extracted coal and bitumen rich coal in confined pyrolysis experiments

Pan

et al. 2013

Organic Geochemistry

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Section: Discussionmentioning

confidence: 47%

Section: Discussionmentioning

confidence: 94%

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Hydrocarbon generation from coal, extracted coal and bitumen rich coal in confined pyrolysis experiments

Pan

et al. 2013

Organic Geochemistry

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“…Schematic stratigraphy and hydrocarbon source rocks, reservoirs and cap rocks in the Kuqa Depression within the Tarim Basin (modified after Zhao et al, 2005 andZeng et al, 2010).…”

Section: Figmentioning

confidence: 99%

Depositional and Diagenetic Controls on Pore Structure of Tight Gas Sandstone Reservoirs: Evidence from Lower Cretaceous Bashijiqike Formation in Kelasu Thrust Belts, Kuqa Depression in Tarim Basin of West China

et al. 2015

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Deeply buried Lower Cretaceous Bashijiqike sandstones are important gas exploration targets in the Kelasu thrust belt, Kuqa Depression of Tarim Basin in China. The sandstones are characterized by low porosity, low permeability and strong microscopic heterogeneity due to diagenesis during their geologic history. Mineralogical, petrographic, and geochemical analyses combined with high-pressure mercury injection analysis have been used to investigate the diagenesis, diagenetic minerals, and their impact on reservoir quality. This article addresses the controls exerted by depositional parameters and diagenetic modifications on pore-network characteristics (porosity, pore types, sizes, shapes, and distribution), with the aim to unravel the formation mechanisms of this complex pore structures, and to improve the characterization and classification evaluation for the Bashijiqike sandstone reservoirs. The Bashijiqike sandstones are dominated by lithic arkoses and feldspathic litharenite. The pore system consists of intergranular macropores, intergranular micropores, and intragranular pores. Framework grains are generally heavily compacted. Authigenic quartz, authigenic feldspar, clay minerals and carbonates are the major pore-filling constituents. The pore structure is characterized by small pore radius and poor interconnectivity. Entry pressure reflects the microscopic pore network and macroscopic reservoir property characteristics. Pore structure characteristics are linked to the depositional parameters, type and degree of diagenesis. Clays do not control reservoir pore networks alone, and pores and pore throats are wider in coarser grained sandstones. Entry pressure decreases with the content of the rigid quartz. Compaction and cementation continue to decrease the pore-throat size, while dissolution enlarges pores and pore-throats radius. Considerable amounts of microporosity associated with clay minerals and altered grains contribute to the high entry pressure. Comprehensive Coefficient of Diagenesis (CCD), which considers the integrative effect of diagenesis, shows strong statistical correlations with entry pressure. CCD is an integrative modulus of diagenesis and physical property, and generally the higher the values are, the better the pore structure. It is suitable for quantitatively characterizing pore structure in tight gas sandstones. The results of this work can help assess pore-network characteristics like the Bashijiqike sandstones which had experienced strong diagenetic modifications during their geological history.

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“…1). One outcrop was sampled in the Kuchehe profile in the Kuqa Depression, which is the prolific hydrocarbonbearing foreland basin in the Tarim Basin (Zhao et al 2005). These three rock samples are Upper Triassic mudstones.…”

Section: Samples and Geological Settingsmentioning

confidence: 99%

Distribution and geochemical significance of phenylphenanthrenes and their isomers in selected oils and rock extracts from the Tarim Basin, NW China

Huang

Zhang

et al. 2016

Pet. Sci.

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Twenty-two oil samples and eight source rock samples collected from the Tarim Basin, NW China were geochemically analyzed to investigate the occurrence and distribution of phenylphenanthrene (PhP), phenylanthracene (PhA), and binaphthyl (BiN) isomers and methylphenanthrene (MP) isomers in oils and rock extracts with different depositional environments. Phenylphenanthrenes are present in significant abundance in Mesozoic lacustrine mudstones and related oils. The relative concentrations of PhPs are quite low or below detection limit by routine gas chromatography-mass spectrometry (GC-MS) in Ordovician oils derived from marine carbonates. The ratio of 3-PhP/3-MP was used in this study to describe the relative abundance of phenylphenanthrenes to their alkylated counterparts-methylphenanthrenes. The Ordovician oils in the Tabei Uplift have quite low 3-PhP/3-MP ratios (\0.10), indicating their marine carbonate origin, associating with low Pr/Ph ratios (pristane/phytane), high ADBT/ ADBF values (relative abundance of alkylated dibenzothiophenes to alkylated dibenzofurans), low C 30 diahopane/C 30 hopane ratios, and low Ts/(Ts ? Tm) (18a-22, 29, 30-trisnorneohopane/(18a-22, 29, 30-trisnorneohopane ? 17a-22, 29, 30-trisnorhopane)) values. In contrast, the oils from Mesozoic and Paleogene sandstone reservoirs and related Mesozoic lacustrine mudstones have relatively higher 3-PhP/ 3-MP ratios ([0.10), associating with high Pr/Ph, low ADBT/ ADBF, high Ts/(Ts ? Tm), and C 30 diahopane/C 30 hopane ratios. Therefore, the occurrence of significant amounts of phenylphenanthrenes in oils typically indicates that the organic matter of the source rocks was deposited in a suboxic environment with mudstone deposition. The phenylphenanthrenes may be effective molecular markers, indicating depositional environment and lithology of source rocks.

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Gas systems in the Kuche Depression of the Tarim Basin: Source rock distributions, generation kinetics and gas accumulation history

Cited by 71 publications

References 13 publications

Hydrocarbon generation from coal, extracted coal and bitumen rich coal in confined pyrolysis experiments

Hydrocarbon generation from coal, extracted coal and bitumen rich coal in confined pyrolysis experiments

Depositional and Diagenetic Controls on Pore Structure of Tight Gas Sandstone Reservoirs: Evidence from Lower Cretaceous Bashijiqike Formation in Kelasu Thrust Belts, Kuqa Depression in Tarim Basin of West China

Distribution and geochemical significance of phenylphenanthrenes and their isomers in selected oils and rock extracts from the Tarim Basin, NW China

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