Carboniferous source rocks in the Ludong-Wucaiwan area, Junggar Basin, NW China

Wang, Xulong; Zhao, Minghui; Baoli, Xiang; Jiang, Da; Jiang, Yiqin; Liu, Cuimin

doi:10.1016/s1876-3804(10)60052-3

Cited by 27 publications

(9 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the complex geological background of the Junggar Basin, the paleo-geothermal gradient and the paleo-heat flow methods (Lerche et al 1984;Wang et al 2001) are Wang et al 2010). Thermal conductivity values (K) are from Rao et al 2013, which are used for later thermal modeling integrated to reconstruct the thermal history.…”

Section: Inversion Methodsmentioning

confidence: 99%

“…However, a small amount of younger source rocks from the Middle Permian and Lower Jurassic also can feed to the Carboniferous reservoirs in some regions (Yu et al 2014). Overall, these source rocks could provide effective supplies of oil and gas for the Carboniferous pyroclastic and the Permian clastic reservoirs (He et al 2010;Li et al 2009;Wang et al 2010).…”

Section: Carboniferous Source Rocksmentioning

confidence: 99%

“…The discovered Carboniferous hydrocarbons mainly reserved on the volcanic rocks of Batamay Formation (C 2 b) by now, although the sandy conglomerates of Lower Carboniferous could be potential reservoir. The Batamay Formation (C 2 b) contains grayish green basalts, andesites, tuffs with minor gray sandstones, dark gray mudstones, carbonaceous mudstones and coals (Wang et al 2010). These volcanic rocks could form the weathering crust and the interior interval reservoirs with favorable porosity and permeability condition owing to the long periods of weathering and leaching, the dissolution of organic acid or deep thermal fluids (He et al 2010).…”

Section: Carboniferous Reservoirmentioning

confidence: 99%

See 2 more Smart Citations

Thermal and maturation history for Carboniferous source rocks in the Junggar Basin, Northwest China: implications for hydrocarbon exploration

Rao

Wang

et al. 2020

Pet. Sci.

View full text Add to dashboard Cite

The reconstruction of thermal history is an important component of basin evolution and hydrocarbon exploration. Based on vitrinite reflectance data, we integrate the paleo-temperature gradient and paleo-heat flow methods to reconstruct the thermal history of Junggar Basin. Compared with present thermal state, the Junggar Basin experienced much a higher heat flow of ca. 80-120 mW/m 2 during the Carboniferous. This feature can be attributed to large-scale volcanic events and related thermal effects. The hydrocarbon maturation history of Carboniferous source rocks indicates that the temperature rapidly reached the threshold of hydrocarbon generation during the Late Carboniferous and has never achieved such a high level since then. This characteristic resulted in the early maturation of hydrocarbons in Carboniferous source rocks. Meanwhile, the results reveal that hydrocarbon maturities are different among various tectonic units in Junggar Basin. The kerogen either rapidly broke through the dry gas period so that cracking of gas occurred or remained in the oil maturation window forming oil reservoirs, which depended on the tectonic background and depositional environment. In this study, we present the thermal and hydrocarbon maturation history since the Carboniferous, which has important implications for further hydrocarbon exploration in Junggar Basin.

show abstract

Section: Inversion Methodsmentioning

confidence: 99%

Section: Carboniferous Source Rocksmentioning

confidence: 99%

Section: Carboniferous Reservoirmentioning

confidence: 99%

See 1 more Smart Citation

Thermal and maturation history for Carboniferous source rocks in the Junggar Basin, Northwest China: implications for hydrocarbon exploration

Rao

Wang

et al. 2020

Pet. Sci.

View full text Add to dashboard Cite

show abstract

“…Previous studies have shown that the Dongdaohaizi Depression has experienced several critical stages of tectonic movement, especially the long-term volcanic activity during the Carboniferous promoted the source rocks to reach a higher maturity stage. Frequent tectonic movements cause severe erosion of Triassic strata and restrict the development of Triassic source rocks in the work area. ,, The Himalayan movement caused the Dongdaohaizi Depression to tilt to the southwest, thus changing the high level in the southwest and the low level in the northeast to the structural pattern of the slope in the Northeast. There are three sets of thick argillaceous deposits in the Dongdaohaizi Depression: the Carboniferous carbonaceous mudstone deposit, the Permian dark-gray mudstone deposit, and the Jurassic carbonaceous mudstone deposit (Figure ).…”

Section: Geological Settingmentioning

confidence: 99%

Origin and Genesis of the Permain Hydrocarbon in the Northeast of the Dongdaohaizi Depression, Junggar Basin, China

Zhou

et al. 2022

ACS Omega

View full text Add to dashboard Cite

Dongdaohaizi area is an important hydrocarbon-rich depression in the Junggar Basin. Early resource evaluation has revealed that it has superior hydrocarbon generation conditions. No major exploration breakthrough has been observed in the hydrocarbon from the Permian Pingdiquan Formation source rocks, which are widely distributed and have a large sedimentary thickness. The unclear recognition of the genesis, the sources, and the hydrocarbon evolution history of the formation seriously restricted further exploration and development. Sixty-four samples were acquired during the study, consisting of 30 source rocks, 13 crude oil samples, and 21 natural gas samples. Studying the geochemical characteristics of the source rock extract and the surrounding structural crude oil in the Dongdaohaizi Depression, the differences in the stable carbon isotope, the biomarker compound, and the molecular relative composition of the three sets of main source rock products in the research fields are summarized. The results reflect that the drying coefficient of natural gas in the study area is generally low, and the fractional distillation value of methane and ethane is 0.32, which is most likely due to the loss of oil and gas migration and the mixing of different types of natural gases. The carbon isotope value is relatively low, with the Pr/Ph being generally less than 3.0. The content of sterane C 29 is the highest in the relative composition of steranes, followed by the content of sterane C 28 , which together account for more than 80% of the total sterane content, and then followed by a lower content of C 27 sterane, accounting for only 5–20% of the total content, which generally conforms to the characteristics of Permian Pingdiquan Formation source rock products. The carbon isotope value of crude oil ranges from −30.94 to −28.31‰, which is different from the characteristics of typical Permian source rocks (values range from −34.49 to −28.21‰), while it is related to typical Carboniferous products (values range from −29.98 to −24.1‰), indicating that small amounts of Carboniferous source rock products were mixed in different degrees in the Dinan fault area. According to the distribution law of oil and gas, the geochemical characteristics and hydrocarbon sources were considered the oil source in the east of the Dongdaohaizi Depression, mainly from the source rocks of the Permian Pingdiquan Formation. The products of the peak period of hydrocarbon generation in the source rocks of the Pingdiquan Formation have not been transported to the high structural positions on a large scale to form reservoirs. They may still exist in the deep part of the Depression and the slope area. The low-amplitude structural and lithologic traps in the slope area of the Dongdahaizi Depression are promising targets for finding the products of the peak period of hydrocarbon generation. This is of great significance to reveal the Permain hydrocarbon evolution in the Junggar Basin ...

show abstract

“…Our study introduces the concept of lithology combinations to represent various lithological factors that could affect fractures and demonstrates the impact that these lithological parameters impose on fracture development. Previous studies only showed the lithological changes and combinations on the qualitative level [11][12][13]. However, lithology combinations and rock arrangements can affect fracture development and follow some laws.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Prediction of Fractures in Shale Using the Lithology Combination Index

Zhang

Yuan

et al. 2020

Minerals

View full text Add to dashboard Cite

Fractures, which are related to tectonic activity and lithology, have a significant impact on the storage and production of oil and gas in shales. To analyze the impact of lithological factors on fracture development in shales, we selected the shale formation from the Da’anzhai member of the lower Jurassic shales in a weak tectonic deformation zone in the Sichuan Basin. We defined a lithology combination index (LCI), that is, an attribute quantity value of some length artificially defined by exploring the lithology combination. LCI contains information on shale content at a certain depth, the number of layers in a fixed length (lithology window), and the shale content in the lithology window. Fracture porosity is the percentage of pore volume to the apparent volume of the rock. In the experiment, fracture porosity was obtained using 50 samples from six wells, by observing rock slices under a microscope. The relationship between LCI and fracture porosity was analyzed based on machine learning, regression analysis, and weighting methods. The results show that LCI is able to represent the impact of multiple lithological factors (i.e., shale content at a certain depth, the number of layers in the lithology window, and the shale content in the lithology window). The LCI within a thickness of 2 m for the lithology window demonstrates a good linear relationship with fracture porosity. We therefore suggest LCI be used for fracture predictions of shale formations from weak tectonic deformation zones. Our proposed LCI and fracture prediction methods also provide implications for sandstone, mudstone, or carbonate formations under similar processes.

show abstract

Carboniferous source rocks in the Ludong-Wucaiwan area, Junggar Basin, NW China

Cited by 27 publications

References 2 publications

Thermal and maturation history for Carboniferous source rocks in the Junggar Basin, Northwest China: implications for hydrocarbon exploration

Thermal and maturation history for Carboniferous source rocks in the Junggar Basin, Northwest China: implications for hydrocarbon exploration

Origin and Genesis of the Permain Hydrocarbon in the Northeast of the Dongdaohaizi Depression, Junggar Basin, China

Quantitative Prediction of Fractures in Shale Using the Lithology Combination Index

Contact Info

Product

Resources

About