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May 08, 2023Open Access
Sedimentary environments are an important part of paleogeography and sedimentology, and there is a long history of using geochemical and mineralogical methods to analyze palaeoenvironmental problems using sedimentary rocks as a research vehicle. By summarizing the important results of previous work on tracing the palaeoenvironment using the composition and distribution characteristics of the macronutrients and trace elements as well as the characteristics of mineral composition, we aim to sort o...
Apr 28, 2023Open Access
In this paper, we analyzed the characteristics of fossil legume pods from the “Committee Creek” formation of the Teater Road, John Day Formation in Crook County, Oregon, in western North America. 23 fossil specimens were collected and compared with the existing genera of the family through detailed observation of the legume pods. A total of three genera and four species of nearest relatives were identified as extant, and four undetermined species were studied. These include the similar species o...
Apr 27, 2023Open Access
Based on the coring data of 48 wells and the logging data of 213 wells, this paper comprehensively analyzes the shallow water delta sedimentation and sand body stacking characteristics of the Yanchang 6 1-6 2 sub-member of the Triassic in the Zichang area of northern Shaanxi, as well as the corresponding relationship with reservoir physical properties. According to the accommodation space and sediment supply flux, the single sand bodies in the study area are distributed in an...
Apr 12, 2023Open Access
Taking Yan10 member of Bai211 well area of Nanliang oilfield as the research object, the stratigraphic subdivision, sedimentary facies type and sand body distribution characteristics are analyzed by making full use of drilling and core data. The results show that Yan10 formation can be subdivided into Yan101, Yan102, Yan103 and Yan104. Braided channel, core beach and flood-plain are the main sedimentary microfacies. The extension direction of Yan10 member sand body is north to south, and the who...
Apr 07, 2023Open Access
The Triassic Yanchang Formation 6 in Ordos Basin is mainly developed with low porosity and low permeability sandstone reservoirs. The development effect in recent years is not ideal, so the Chang-6 reservoir has become a key research object. Through core observation, thin section identification, well logging data and other analysis and testing, the research on the petrology, reservoir space and reservoir physical properties of this layer is carried out. The study shows that the rock type that ca...
Mar 31, 2023Open Access
Abundant natural gas resources have been found in the Lower Permian Shihezi Formation in Ordos Basin, among which the 8 member of the Lower Shihezi Formation is one of the important reservoirs. Sedimentary studies and natural gas exploration of the Lower Shihezi Formation in Ordos Basin mainly focus on the interior of the basin. In recent years, DJ gas field, a large Upper Paleozoic tight gas field, has been discovered in the southeastern Ordos Basin. Among them, Hehe 8 is one of the main gas-be...
Mar 13, 2023Open Access
The result of landslide susceptibility assessment (LSA) can be used for landslide hazard management and emergency rescue. Lixian County in Sichuan Province is selected to be the study area for its frequent landslides. Based on the correlation analysis and geological environment interpretation, a total of 9 controlling factors of landslide were selected (i.e., lithology, elevation, slope curvature, slope angle, aspect, normalized difference vegetation index (NDVI), slope length, distance to river...
Feb 27, 2023Open Access
Several sets of sandstones are developed in the Benxi Formation of Carboniferous in the Upper Paleozoic in the Ordos Basin, which are transitional facies of Marine and continental facies and have significant unconventional natural gas potential. In order to reveal the sedimentary reservoir characteristics of the Upper Carboniferous Benxi Formation in the southeastern Ordos Basin, this paper makes comprehensive use of drilling and logging data, combined with various experiments, and conducts an i...
Jan 31, 2023Open Access
The resource potential of the Triassic Yanchang Formation’s Chang 6 reservoir in the southeastern part of the Ordos Basin’s slope is large, whereas it is poor levels of exploration, and reservoir evaluation is not perfect enough, so that, limiting future exploration in this area. It is underpinned by core of detailed observations and descriptions of the Chang 6 reservoir system, typical samples of various sample, oil-bearing properties, and sedimentary structures were collected, and further anal...
Jan 04, 2023Open Access
The formation time of the Chang 6 reservoir was determined semi-quantitatively by petrographic observation, fluorescence spectral analysis, homogeneous temperature test and salinity calculation of fluid inclusions in the Chang 6 reservoir of the Qilicun oilfield, as well as sonic time difference method to recover the stripping thickness of the strata at the end of the Early Cretaceous, based on the study method of burial-thermal evolution history map with homogeneous temperature cast points of i...
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