Research on Three-Dimension Sedimentary Facies Model Building of the Reservoir Chang2 Member, Yanchang Formation in Zhifang Area, Erdos Basin

2012 ◽  
Vol 466-467 ◽  
pp. 303-307 ◽  
Author(s):  
Kun Sheng Qiang ◽  
Jian Min Wang ◽  
Xin Wen Tian ◽  
Xiu Xiang Lü ◽  
Lei Tian
Keyword(s):  
Oil And Gas ◽  
Model Building ◽  
Ordos Basin ◽  
Sedimentary Facies ◽  
Distribution Model ◽  
Small Rivers ◽  
Clear Understanding ◽  
Three Dimension ◽  
Yanchang Formation ◽  
Facies Model

Through the Ordos basin sample with Triassic Yanchang formation Chang 2 member sedimentary facies research and analysis, the use of deterministic modeling and the theory of stochastic modeling, using PETREL software, the establishment of a three-dimensional visualization of the study area Chang 2 member geological reservoir facies model, the model and geological interpretation in the whole match, a true reflection of the sedimentary characteristics of the study area, the numerical simulation for the latter part of remaining oil and provide a geological basis. Sand distribution model based on a clear understanding of sand microfacies characteristics distribution in the plane and space, the combination of relations, proved in the study area is mainly sand flat on the NE - SW band distribution, the distributary channel facies under control the trend of the sand body, in the same succession of small rivers within the good level, migration is not swinging, with micro-facies stability.Chang2 member channel development , is the favorable oil and gas accumulation zones.

Study on the distribution of extractable organic matter in pores of lacustrine shale: An example of Zhangjiatan Shale from the Upper Triassic Yanchang Formation, Ordos Basin, China

2017 ◽  
Vol 5 (2) ◽  
pp. SF109-SF126 ◽  
Author(s):  
Yuxi Yu ◽  
Xiaorong Luo ◽  
Ming Cheng ◽  
Yuhong Lei ◽  
Xiangzeng Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Oil And Gas ◽  
Storage Capacity ◽  
Ordos Basin ◽  
Organic Content ◽  
Capacity Control ◽  
Yanchang Formation ◽  
Geochemical Characterization ◽  
Extractable Organic Matter

Shale oil and gas have been discovered in the lacustrine Zhangjiatan Shale in the southern Ordos Basin, China. To study the distribution of extractable organic matter (EOM) in the Zhangjiatan Shale ([Formula: see text] ranges from 1.25% to 1.28%), geochemical characterization of core samples of different lithologies, scanning electron microscope observations, low-pressure [Formula: see text] and [Formula: see text] adsorption, and helium pycnometry were conducted. The content and saturation of the EOM in the pores were quantitatively characterized. The results show that the distribution of the EOM in the shale interval is heterogeneous. In general, the shale layers have a higher EOM content and saturation than siltstone layers. The total organic content and the original storage capacity control the EOM content in the shale layers. For the siltstone layers, the EOM content is mainly determined by the original storage capacity. On average, 75% of the EOM occurs in the mesopores, followed by 14% in the macropores, and 11% in the micropores. The EOM saturation in the pores decreases with the increase in pore diameter. The distribution of EOM in the shale pores is closely related to the pore type. Micropores and mesopores developed in the kerogens and pyrobitumens and the clay-mineral pores coated with organic matter are most favorable for EOM retention and charging.

Paleogeographic framework and Paleo-sedimentary environmental restoration in the Lower Part of Yanchang formation in Triassic of Ordos Basin, China

2020 ◽  
Author(s):  
Yanhua Xu ◽  
Dengfa He
Keyword(s):  
Ordos Basin ◽  
Sedimentary Facies ◽  
Seismic Profile ◽  
Environmental Restoration ◽  
Yanchang Formation ◽  
North East ◽  
The North ◽  
Trace Elements Analysis ◽  
Oil And Natural Gas ◽  
The Ordos Basin

<p><strong>Title: Paleogeographic framework and Paleo-sedimentary environmental restoration in the Lower Part of Yanchang formation in Triassic of Ordos Basin, Chin</strong><strong>a</strong></p><p>Ordos basin is a craton basin, rich in coal, oil and natural gas resources. The Yanchang formation includes the lower part (Chang 10- Chang 8 oil bearing intervals) and the upper part (Chang 7- Chang 1 oil bearing intervals) in which we found many hydrocarbon-rich depressions. The sedimentary period of Chang 10-Chang 8 formation is the transition stage from the North China Craton depression basin to  Ordos basin due to the influence of the Indosinian movement. Previous studies mainly focused on the the interior of the present residual basin rather than the peripheral of the basin.</p><p>Twenty five outcrops out of Ordos basin and one hundred drilling cores in the basin are used and multiple methods including microscope, SEM observation , the major-trace elements analysis ; zircon U-Pb geochronological studies and seismic profile interpretation are applied to study the paleoredox, paleosalinity , paleoclimate and provenance of the the lower part of the Yanchang formation in the Ordos basin.</p><p>It is concluded that: (1)the main charateristics of the sedimentary facies about Chang 10 is rivers-deltas- shore-shallow lacustrine. The sedimentary facies of Chang 9 has the features of “multi-deltas surrounding the lake” with a transitory lake transgression. The main charateristics of Chang 8 is that the rivers became more powerful and the area of lake increased.(2) based on the zircon U-Pb age structure comparision beween the lower part the Yanchang formation and its periphery old land, the results indicate that it has consistent source, which are mainly northern and southern margin of Huabei block. However, the north-east Alashan old land and south Qinlin-Qilian tectonic belts may just supply few detrital sediments.(3) according to the seismic interpretation, we have found a large number of synsedimentary fault. Seismites developed in Chang9 and Chang8 and turbidite developed in Chang9. The distribution of the synsedimentary fault, seismites and turbidite can cetify that the structure activity was more active in the sedimentary period of the Yanchang formation.</p>

The Structural Characteristics and Distribution of Sand Body of the Layer 7 of YanChang Formation in Ordos Basin

2014 ◽  
Vol 628 ◽  
pp. 360-365
Author(s):  
Qi Qi Lv ◽  
Shun She Luo ◽  
Lin Jing Li ◽  
Rong Dai ◽  
Yu Dong Li
Keyword(s):  
Depositional Environment ◽  
Structural Characteristics ◽  
Ordos Basin ◽  
Sedimentary Facies ◽  
Research Area ◽  
Uniform Thickness ◽  
Yanchang Formation ◽  
Genetic Types ◽  
Sand Body ◽  
Pelvic Shape

The tight sand in the layer 7 of YanChang Formation, Ordos Basin major develops braided river delta and gravity flow deposits. In this paper, based on previous studies on lake pelvic shape, provenance and hydrodynamic, the sand body in the research area has been systematically studied through core observation, logging data, and sedimentary theory. Various genetic types of sedimentary sand body are developed in this area, mainly as delta deposition, sandy debris flow deposits, turbidites (classic turbidites). We can identify 6 kinds of sand vertical combination type, they are the superimposed sand body (A-type), thick and uniform thickness sand body (B type), thin and uniform thickness sand body (C-type), up thinning sand body (D-type), thickening up sand body (E-type) , thick and thin interbed sand body (F-type). The 6 types mainly controlled by sedimentary facies. The A-type sand body mainly developed in the delta depositional environment, the B type sand body is visible both in the delta and slope belt, while the D-type, E-type, F-type sand body are mainly developed in the deep lake. The distribution of sand body in the plane is zonal pattern.

Fractal characteristics of the micropore throats in the shale oil reservoirs of the Chang 7 Member of the Yanchang Formation, Ordos Basin

2022 ◽  
pp. 1-46
Author(s):  
Peng Li ◽  
Zhongbao Liu ◽  
He Bi ◽  
Jun Liu ◽  
Min Zheng ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Fractal Theory ◽  
Ordos Basin ◽  
Shale Oil ◽  
Pore Throat ◽  
Yanchang Formation ◽  
Fractal Characteristics ◽  
Seepage Characteristics

With the development of the global shale oil and gas revolution, shale oil became an important replacement field to increase oil and gas reserves and production. The Chang 7 Member of the Yanchang Formation in the Ordos Basin was an important shale oil exploration series in China. To study the micropore-throat structure characteristics of the Chang 7 Member, we launched nuclear magnetic resonance (NMR) and high-pressure mercury injection (HPMI) experiments to analyze the pore-throat structure features of the Chang 7 reservoir, and we considered fractal theory to study the fractal characteristics. The NMR results indicated that the T2 spectral morphology of the Chang 7 reservoir could be characterized by three main patterns encompassing early and late peaks with different amplitudes: the type 1 reservoir contained mostly small pores and few large pores, and the porosities of the small and large pores range from 4.16% to 9.04% and 0.70% to 2.40%, respectively. The type 2 reservoir contained similar amounts of small and large pores, and the type 3 reservoir contained few small pores and mostly large pores, while the porosities of the small and large pores range from 1.81% to 2.74% and 3.32% to 5.64%, respectively. The pore-throat structure parameters were obviously affected by the pore size distribution, which in turn influenced the reservoir seepage characteristics of the reservoir. The micropore-throat structure of the reservoir exhibited obvious piecewise fractal characteristics and mainly included dichotomous and trilateral fractals. The type 1 reservoirs were dominated by dichotomous fractals, and these two fractal types were equally distributed in the type 2 and 3 reservoirs. The fractal dimension of the pore throats of different scales exhibited a negative correlation with the corresponding porosity, but no correlation was observed with the permeability, indicating that the size of the reservoir determined by pore throats imposed a strong controlling effect on their fractal characteristics.

Features of Sandy Debris Flows of the Yanchang Formation in the Ordos Basin and Its Oil and Gas Exploration Significance

2011 ◽  
Vol 85 (5) ◽  
pp. 1187-1202 ◽  
Author(s):  
Xiangbo LI ◽  
Qilin CHEN ◽  
Huaqing LIU ◽  
Yanrong WAN ◽  
Lihua WEI ◽  
...  
Keyword(s):  
Debris Flows ◽  
Oil And Gas ◽  
Ordos Basin ◽  
Yanchang Formation ◽  
Oil And Gas Exploration ◽  
The Ordos Basin

scholarly journals Thickening-upward cycles in deep-marine and deep-lacustrine turbidite lobes: examples from the Clare Basin and the Ordos Basin

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Lei-Fu Zhang ◽  
Da-Zhong Dong
Keyword(s):  
Oil And Gas ◽  
Ordos Basin ◽  
Element Model ◽  
Layer By Layer ◽  
Yanchang Formation ◽  
Oil And Gas Exploration ◽  
Unconventional Oil And Gas ◽  
Sandstone Formation ◽  
Western Ireland ◽  
Bottom To Top

AbstractDeep-marine and deep-lacustrine reservoirs have been targets for conventional and unconventional oil and gas exploration and development for decades. Thickening-upward cycles in the deep-marine Carboniferous Ross Sandstone Formation outcrops in western Ireland and the deep-lacustrine Triassic Yanchang Formation outcrops in southeast Ordos Basin have been investigated and correlated in this study. Typical thickening-upward cycles consisting of, from bottom to top: (1) laminated shales/shales with interbedded siltstone beds; (2) interbedded sandstones/siltstones and mudstones; (3) structureless massive sandstones, are well recognized in these outcrops and are interpreted as turbidite lobes. A continuously prograding lobe-element model is proposed to explain the repeated stacking of thickening-upward cycles. Thickening-upward cycles developed within deep-marine and deep-lacustrine environments are highly comparable in many aspects, such as sedimentary structures, sheet-like geometries and amalgamation features. A frequent and strong degree of amalgamation is developed within the massive sandstone at the top of each thickening-upward cycle, suggesting a layer-by-layer depositional manner. Field observations and comparison with deep-marine counterparts support the occurrence of turbidity flows in the Yanchang Formation, Ordos Basin.

scholarly journals Geochemical Characteristics and Origins of the Crude Oil of Triassic Yanchang Formation in Southwestern Yishan Slope, Ordos Basin

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Xiaoli Zhang ◽  
Jinxian He ◽  
Yande Zhao ◽  
Hongchen Wu ◽  
Zeqiang Ren
Keyword(s):  
Crude Oil ◽  
Oil And Gas ◽  
Saturated Hydrocarbon ◽  
Ordos Basin ◽  
Water Environment ◽  
Geochemical Characteristics ◽  
Source Rocks ◽  
Gas Chromatography Mass Spectrometry ◽  
Yanchang Formation ◽  
Parent Materials

Biomarker compounds that derived from early living organisms play an important role in oil and gas geochemistry and exploration since they can record the diagenetic evolution of the parent materials of crude oil and reflect the organic geochemical characteristics of crude oil and source rocks. To offer scientific basis for oil exploration and exploitation for study area, gas chromatography-mass spectrometry method is applied to study the biomarker compounds of crude oil in Southwestern Yishan Slope of Ordos Basin, through qualitatively and quantitatively analyzing separated materials. The crude oil of Yanchang Formation and the source rocks of Yan’an and Yanchang Formation were collected in order to systematically analyze the characteristics of the biomarker compounds in saturated hydrocarbon fractions and clarify the organic geochemical characteristics of crude oil. The distribution and composition of various types of hydrocarbon biomarker compounds in crude oil suggest that the parent materials of crude oil are composed of hydrobiont and terrigenous plants, and the crude oil is mature oil which is formed in the weak reducing fresh water environment. Oil source correlation results show that the crude oil of Yanchang Formation in Yishan Slope is sourced from the source rocks of Chang 7 subformation.

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