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...

Geology  Sedimentology 

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...

Geology 

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...

Geology 

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...

Geology 

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...

Geology 

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...

Geology 

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...

Geology  Geochemistry 

Longdong area is located on the southwest edge of the Ordos basin. As the Indosinian movement at the end of the Triassic led to the uplift and erosion of the Ordos basin, the pre Jurassic ancient landform in Longdong area was formed. The erosion weathering time, erosion depth, late filling, etc. of different geomorphic units are obviously different, forming the unconformity structure of different geomorphic units. After studying the logging curve, element geochemistry, physical property and othe...

Geology 

This study concerns the use of isotope techniques to assess groundwater resource management in mining area. The objective of the study is first to estimate the groundwater residence time in the peninsula of Ampasindava and secondly to determine the relationship between wastewater from mining activity and groundwater resource in the study area by using environmental isotopes. It will contribute to clarifying the impact of the mining activity waste water on the groundwater in the study area. The s...

Geology  Environmental Sciences 

Salt-affected soils are widespread in arid and semi-arid areas irrigated around the world, where low-quality irrigation water is common. Every minute, the world loses at least ten hectares (ha) of arable land, three hectares of which are due to salinization issues, particularly in the irrigated desert and semi-arid regions. The cost of soil salinization for agriculture is now estimated at more than $12 billion per year and is expected to increase as soils are increasingly impacted by irrigation ...

Geology