Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China

To lay the foundation for the exploration of shale gas, we calculated the total organic carbon (TOC) of Shahezi Formation source rocks in the Xujiaweizi Fault Depression in the Songliao Basin by using the measuring data and the logging curves. Because the source rocks in the study area were formed in a lacustrine basin, they are characterized by strong organic heterogeneity, making it difficult to objectively characterize any changes in the TOC of the underground source rocks based on discrete and limited sampling. In addition, because the source rock is relatively rich in shale and poor in organic matter, the logging response features of high natural gamma, medium-high interval transit time, and medium-low resistivity, making it easily identified. However, because the logging parameters to predict the TOC of source rocks are not universal, it is impossible to establish a prediction equation that is universally applicable. To solve the above problems, we used the variable-coefficient [Formula: see text] technique to predict the TOC of the source rocks in the study area. We defined the two key parameters that affect the TOC prediction in the classic [Formula: see text] technique as the undetermined coefficients, and the coefficients were determined according to the logging and geologic data of the individual wells. The application results indicate that the variable-coefficient [Formula: see text] technique has an average relative error of 17.5% in the prediction of the TOC, which is 16.1% lower than that of the classic [Formula: see text] technique. Thus, the prediction results can effectively reflect the vertical variation in the TOC of source rocks. Based on the logging evaluation results for the TOC of source rocks in 35 wells throughout the study area, the thickness of the high-quality source rocks in the fourth member of the Shahezi Formation was mapped. The thickness of the high-quality source rocks in the fourth member of the Shahezi Formation is generally [Formula: see text]. There are two centers of greater thickness in the plane, with the maximum thickness of more than 70 m.

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Source Rocks of the Fuyu-Yang Dachengzi Oil-layer in the Chaoyanggou Oilfield, Songliao Basin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.962-965.630 ◽

2014 ◽

Vol 962-965 ◽

pp. 630-635

Author(s):

Lei Zhang ◽

Lun Wei Zhu ◽

Zhen Lin Yi ◽

Dong Hui Zhu

Keyword(s):

Crude Oil ◽

Oil And Gas ◽

Songliao Basin ◽

Source Rocks ◽

Close Relationship ◽

The Relationship

Based on the biomarks parameters, we contrast and analyze the relationship between the crude oil of Fuyu and Yangdachengzi oil beds in Chaoyanggou oilfield and the mudstone source rocks of the 1st Member of Qingshangkou formation in Sanzhao depression. There are two source rocks of crude oil in Fuyu oil bed of Chaoyanggou oilfield. They are the mudstone source rocks of the 1st Member of Qingshangkou formation in Sanzhao depression and in Chaoyanggou oilfield, and the contribution of the two source rocks to Fuyu oil bed are nearly the same. The crude oil of Yangdachengzi oil bed in Chaoyanggou oilfield has close relationship to the mudstone source rocks of the 1st Member of Qingshangkou formation in Sanzhao depression, but the relationship with the mudstone source rocks of the 1st Member of Qingshangkou formation in Chaoyanggou oilfield is not obvious. It conforms to the facts that the lower overpressure of mudstone source rocks in Chaoyanggou oilfield makes the thickness of the oil and gas downward shallowed and the quantity of oil into Yangdachengzi oil bed decreased.

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The Geochemical Characteristics of High Quality Hydrocarbon Source Rocks - A Case Study of Hailaer Basin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.868.107 ◽

2013 ◽

Vol 868 ◽

pp. 107-112

Author(s):

Dan Ning Wei ◽

Gui Lei Wang

Keyword(s):

Organic Matter ◽

Oil And Gas ◽

Geochemical Characteristics ◽

Source Rocks ◽

Common Source ◽

Hydrocarbon Source Rock ◽

High Quality ◽

Hydrocarbon Source Rocks ◽

Study Zone ◽

Hydrocarbon Expulsion

The distribution of high quality hydrocarbon source rocks plays an important role in the accumulation of oil and gas. As a result, the identification of geochemical characteristics of high quality source rocks is the key to discriminate the distribution of high quality source rocks accurately. By core observation and sample analysis, taking Wuerxun-Beier depression in Hailaer Basin as the target regions, we make accurate discrimination of high quality hydrocarbon source rock developmental characteristics and comparison with common source rocks. The research shows that: (1) the hydrocarbon expulsion efficiency in study zone is high due to the alternating deposits of high quality hydrocarbon source rocks and sandstones. The high quality hydrocarbon source rocks deposited in the reducing environment to strong reducing ones, whereas common rocks deposited in oxidizing environment to weak oxidizing ones. (2) the occurrence of organic matter of high quality hydrocarbon source rocks is mainly in stratified enrichment type. The organic matter develops parallel bedding or basic parallel bedding. However, the distribution of organic matter of common source rocks is porphyritic and heterogeneous, or interrupted lamellar. (3) the hydrocarbon potential of high quality hydrocarbon source rocks is more than ten times that of common source rocks. (4) the content of organic carbon in high quality source rocks is high and the content of chloroform asphalt A is relatively low, which reflects that the hydrocarbon expulsion efficiency of high quality source rocks in the sand-shale interbeds of study zone is high.

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Accumulation Characteristics of Tight Sandstone Oil below Source Rocks and Its Major Controlling Factors: Fuyu Oil Layer in Da'an Area in Songliao Basin, NE China

Acta Geologica Sinica - English Edition ◽

10.1111/1755-6724.12304_24 ◽

2015 ◽

Vol 89 (s1) ◽

pp. 273-276

Author(s):

Yu SUN ◽

Ming DENG ◽

Yao XIANG ◽

Shizhong MA ◽

Baiquan YAN ◽

...

Keyword(s):

Controlling Factors ◽

Songliao Basin ◽

Source Rocks ◽

Ne China ◽

Tight Sandstone ◽

Accumulation Characteristics

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The Logging Evaluation of the Relationship between Source Rock and Oil Layer Distribution in Southern Songliao Basin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.962-965.574 ◽

2014 ◽

Vol 962-965 ◽

pp. 574-577

Author(s):

Li Jun Xiu ◽

He Ping Pan ◽

Hao Xiu

Keyword(s):

Source Rock ◽

Quality Evaluation ◽

Songliao Basin ◽

Source Rocks ◽

Source Control ◽

Theory Theory ◽

High Quality ◽

The Relationship ◽

Effective Source

At present, Most of the studies on source rocks is above the effective source rock identification and quality evaluation. But the spatial distribution of the high quality source rocks do not necessarily reflect the position of the layer. So, logging evaluation of the relationship between source rock and layer distributed in a region is necessary. In this paper 70 cores have selected from 4 wells in the first period of Qingshankou (q1), Songliao Basin, then get the experimental TOC value after core analysis. On the basis of source rock geochemical analysis, the author estimated the source rock TOC value with the ∆lgR method. As the distribution of high quality source rocks are clarified,the author draw a conclusion by researching on the relationship between the distribution of source rocks and layers which based on the "Source Control Theory" theory. Finally, it is found that the quality of the source rocks and layer distribution match well in both horizontal and vertical in this paper. This discovery is important for layer prediction and researches.

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Discovery of the lower Cambrian high-quality source rocks and deep oil and gas exploration potential in the Tarim Basin, China

AAPG Bulletin ◽

10.1306/03141817183 ◽

2018 ◽

Vol 102 (10) ◽

pp. 2123-2151 ◽

Cited By ~ 20

Author(s):

Guangyou Zhu ◽

Feiran Chen ◽

Meng Wang ◽

Zhiyao Zhang ◽

Rong Ren ◽

...

Keyword(s):

Tarim Basin ◽

Lower Cambrian ◽

Oil And Gas ◽

Source Rocks ◽

High Quality ◽

Oil And Gas Exploration

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Dorado discovery – unlocking a major new oil and gas play in the Bedout Sub-basin

The APPEA Journal ◽

10.1071/aj19128 ◽

2020 ◽

Vol 60 (2) ◽

pp. 778

Author(s):

Melissa Thompson

Keyword(s):

Joint Venture ◽

Oil And Gas ◽

Seismic Inversion ◽

Source Rocks ◽

High Quality ◽

Well Control ◽

Light Oil ◽

Set Up ◽

Inversion Techniques

In 2014, Santos (formerly Apache and Quadrant Energy Limited) acquired an operated exploration position over most of the under-explored Bedout Sub-basin. A multi-year exploration program was subsequently executed, targeting plays within Middle Triassic fluvio-deltaic sediments of the Lower Keraudren and Archer formations. Initial wells at Phoenix South and Roc established the presence of high-quality reservoirs, source rocks and hydrocarbon fluids, but the commerciality of these discoveries was impeded by the lack of existing production infrastructure in this frontier basin. In 2018, Santos and its Joint Venture partner, Carnarvon Petroleum, drilled Dorado-1, targeting stacked Archer Formation reservoirs in an erosional truncation trap set up by a major canyon system. The well encountered light oil and/or condensate rich gas in high-quality reservoir sands at each of the target intervals. Despite limited well control, burial depths on the order of 4000 m and imperfect seismic data, the pre-drill prognosis was remarkably accurate, largely due to the application of modern seismic inversion techniques. Subsequent appraisal drilling undertaken during 2019 demonstrated the discovery is larger than originally anticipated and has significantly de-risked a future development. New seismic acquired during 2019 will be used to further improve the understanding of Dorado reservoirs and to mature follow-up prospects for future drilling.

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