Environmental response to volcanic activity and its effect on organic matter enrichment in the Permian Lucaogou Formation of the Malang Sag, Santanghu Basin, Northwest China

Pan, Yongshuai; Huang, Zhilong; Li, Tianjun; Guo, Xingwei; Xu, Xiongfei; Chen, Xuan

doi:10.1016/j.palaeo.2020.110024

Cited by 40 publications

(34 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Volcanic activities were active during the period of Carboniferous, resulting in a series of volcanic deposits in the northwestern Junggar Basin, including tuff, volcanic breccia, andesite, tuffaceous mudstone, and so forth. Some studies have proven that volcanism has positive effects on the enrichment of OM . There are also some corresponding source rocks deposited during the interval of the volcano eruptions.…”

Section: Resultsmentioning

confidence: 99%

Origins of Organic Matter, Paleoenvironment, and Hydrocarbon Potential of the Carboniferous Source Rocks from Shibei Sag, Junggar Basin, NW China

Chen

Jin

Zhu³

et al. 2022

ACS Earth Space Chem.

View full text Add to dashboard Cite

The organic-rich sediments of the Carboniferous in the Shibei Sag, Junggar Basin, China are potential source rocks with good hydrocarbon generation conditions for oil and gas exploration. Thus, it is meaningful to analyze their geochemical characteristics, including the hydrocarbon generation potential, genetic types of kerogen, thermal maturity, the origin of organic matter (OM), and sedimentary environment. The results reveal that the Carboniferous source rocks have fair to excellent hydrocarbon generation potential. They are mainly gas-prone with type III-IIkerogens. Random vitrinite reflectance (Rr) of the studied samples ranges from 0.63 to 1.04%, suggesting a primarily mature stage, which is also supported by the maturity-related hopane and sterane ratios. Stable carbon isotopic compositions, organic petrological macerals, and biomarker characteristics all indicate a predominant higher plant input. Abundant bicyclic sesquiterpenoids and diterpenoid biomarkers in the studied samples suggest the conifer inputs. In particular, high amounts of phyllocladanes, retene, and kauranes suggest the contribution of gymnosperms, pre-gymnosperms, pteridophytes, or bryophytes in swamps. From the early Carboniferous to the late Carboniferous, the environment became more oxic, the water level dropped, and higher plants flourished. Based on the abovementioned results, the Carboniferous source rocks were likely to be deposited in a transitional environment under lacustrine-fluvial conditions. Specifically, source rocks from the Batamayineishan Formation were deposited in a peat environment during the interval of the volcano eruptions. Considering the quantity and maturity of OM and their large thickness, the Carboniferous sediments have a good petroleum exploration potential.

show abstract

Section: Resultsmentioning

confidence: 99%

Origins of Organic Matter, Paleoenvironment, and Hydrocarbon Potential of the Carboniferous Source Rocks from Shibei Sag, Junggar Basin, NW China

Chen

Jin

Zhu³

et al. 2022

ACS Earth Space Chem.

View full text Add to dashboard Cite

show abstract

“…Overall, the relatively high-saline paleosalinity might result from the strong evaporation induced by drier and/or hotter climate in a relatively closed lake during the M3 deposition period [88], as indicated by the positive or negative correlations between C-value, Sr/Cu, Sr/Ba, B eq , and S-value (Figure 3). 5.4.3.…”

Section: Paleosalinitymentioning

confidence: 99%

“…The P/Ti and Ba/Al ratios of the samples show relatively narrow ranges of 0.14-0.36 (0.26 on average) and 15.69-41.32 (29.24 on average) (Table 2). In terms of the P/Ti ratio, this ratio for the studied samples is higher than that of PAAS (P/Ti = 0.13) [47], and Permian Lucaogou Formation fine-grained rocks (P/Ti = 0.16 on average) with high TOC contents (~4.22% on average) in the Santanghu Basin [88], implying a relatively high primary productivity with stable vertical variations during the M3 deposition period.…”

Section: Paleosalinitymentioning

confidence: 99%

“…This result may suggest that the preservation conditions instead of primary productivity are much more important for the enrichment of OM and, also, reflect that the primary OM inevitably experienced some degree of postdepositional oxidation. Fe/Mn ratio can be generally used as a common index for the relative paleowater depth [88,89]. As shown in Figure 3, under relatively deep-waters (low Fe/Mn ratio), the TOC contents, primary productivity, and paleosalinity are relatively higher, and the redox state is relatively more reducing (but not up to dysoxic level) relative to the relatively shallow-waters (high Fe/Mn ratio).…”

Section: Geofluidsmentioning

confidence: 99%

See 1 more Smart Citation

Organic-Inorganic Geochemical Characteristics of the Upper Permian Pusige Formation in a High-Saline Lake Basin, Tarim Basin: Implications for Provenance, Paleoenvironments, and Organic Matter Enrichment

Wang

Zhu

et al. 2021

Geofluids

View full text Add to dashboard Cite

The third member (M3) of the Upper Permian Pusige Formation is a prominent organic-rich lacustrine mudstone sequence within the Yecheng-Hetian Sag, Tarim Basin, hosting major petroleum resources. However, its depositional history and organic matter (OM) enrichment mechanism have received little attention. Therefore, various organic and inorganic geochemical analyses were performed on thirty-four core samples from the Well DW1, to elucidate their depositional paleoenvironments, provenance, and tectonic setting, as well as the controlling factors of OM enrichment. Results showed that the M3 mudstones are classified as poor- to fair-quality hydrocarbon source rocks with mature type II-III kerogen, considering their low organic geochemical parameters. Paleosalinity indexes (e.g., Beq, Sr/Ba, and B/Ga) indicated the typical high-saline lacustrine water body, in which redox state was the oxic-dysoxic as suggested by multiple indicators. Many paleoclimate and weathering proxies suggest a dominant semiarid condition and low weathering degree in the Yecheng-Hetian Sag, which led to that weathered felsic rocks from the West Kunlun Orogen to the southwest of basin were quickly transported into the lake basin. Detrital materials carrying nutrient elements finally promoted the development of relatively high paleoproductivity indicated by fairly high P/Ti and Ba/Al ratios. The negative relationship between P/Ti and total organic carbon (TOC) indicates that paleoproductivity was not the main controlling factor. The correlations among TOC and P/Ti and other multiple proxies suggest that the OM enrichment can be interpreted as both the “preservation model” and “dilution model.” Although the water body was relatively oxygen-riched, high sedimentation rate could largely shorten the exposure time of OM with oxygen, thus decreased the decomposition of OM. In particular, the high-saline, stratified lake water may also restrain the degradation of OM. Furthermore, detrital dilution exerted a potential effect on TOC abundances. On the basis of the above results, a developing model was established to decipher the formation mechanism of OM in these M3 mudstones.

show abstract

“…In such events, volcanic ash would be beneficial to the enrichment and preservation of organic matter [18,19] and promotes the conversion of organic matter to hydrocarbons [20][21][22]. These were some positive impacts of volcanic activities on various components of the petroleum system; however, its destructive effects on hydrocarbon accumulation cannot be neglected either.…”

Section: Introductionmentioning

confidence: 99%

Accumulation and Distribution of Natural Gas Reservoir in Volcanic Active Area: A Case Study of the Cretaceous Yingcheng Formation in the Dehui Fault Depression, Songliao Basin, NE China

et al. 2021

View full text Add to dashboard Cite

Tight gas sandstone and volcanic gas reservoirs have received global attention in the energy arena for further exploration and exploitation attempts. Considering the Yingcheng Formation of Dehui fault depression in the Songliao Basin as an example, this study focused on the accumulation and distribution of natural gas reservoirs in volcanic area in a fault depression basin. Volcanic activities occurred in the Yingcheng Formation, which is distributed centrally in the northwest of the study area. During the sedimentation of the Yingcheng Formation, fan-delta, lacustrine, and nearshore subaqueous fan facies were deposited. The source rocks of the Yingcheng Formation have high abundance of organic matter mainly in type III at high-overmature stages, indicating favorable conditions for gas production. The porosity of volcanic reservoir is 3.0%-14.8%, the permeability is 0.0004 mD-2.52 mD, and the pore types are mainly secondary dissolved pores and fractures. Besides, the porosity of the tight sandstone reservoir is 0.5%-11.2%, and the permeability is 0.0008 mD-3.17 mD. The pore types are mainly interparticle pores, with a small proportion of intraparticle pores and microfractures. The intrusion of late volcanic magma provided sufficient heat for the thermal maturity progression of organic matter in Yingcheng Formation and promoted the generation of natural gas in large quantities. Volcanic rocks formed at the early and middle stages of volcanic activities occupied the sedimentary space and hindered the development of sedimentary sand bodies to a certain extent. However, volcanic rocks can become the seal to promote the formation of tight sandstone gas traps. Comparing tight sandstone reservoirs with volcanic ones, the latter are less affected by compaction; thus, their petrophysical properties do not vary much with depth, showing more homogeneous characteristics. The pyroclastic rocks influenced by volcanic activity and the secondary pores formed by dissolution in the later stages also provide reservoir space for gas accumulation. Ultimately, the tight sandstone and volcanic rocks in the study area form a complex gas reservoir system, which can become a reference for exploration and exploitation of natural gas in other petroliferous fault depressions that are affected by volcanisms.

show abstract

Environmental response to volcanic activity and its effect on organic matter enrichment in the Permian Lucaogou Formation of the Malang Sag, Santanghu Basin, Northwest China

Cited by 40 publications

References 71 publications

Origins of Organic Matter, Paleoenvironment, and Hydrocarbon Potential of the Carboniferous Source Rocks from Shibei Sag, Junggar Basin, NW China

Origins of Organic Matter, Paleoenvironment, and Hydrocarbon Potential of the Carboniferous Source Rocks from Shibei Sag, Junggar Basin, NW China

Organic-Inorganic Geochemical Characteristics of the Upper Permian Pusige Formation in a High-Saline Lake Basin, Tarim Basin: Implications for Provenance, Paleoenvironments, and Organic Matter Enrichment

Accumulation and Distribution of Natural Gas Reservoir in Volcanic Active Area: A Case Study of the Cretaceous Yingcheng Formation in the Dehui Fault Depression, Songliao Basin, NE China

Contact Info

Product

Resources

About