Oil generation as the dominant overpressure mechanism in the Cenozoic Dongying depression, Bohai Bay Basin, China

Guo, Xiaowen; He, Sheng; Liu, Keyu; Song, Guoqi; Wang, Xunjun; Shi, Zheming

doi:10.1306/05191009179

Cited by 146 publications

(111 citation statements)

References 59 publications

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“…Coupling the gravity-seismic-well integrated interpretation and the previous study of regional structural background [5,7,10] with the above study of the gravitational field and the fault system, the Qingdong area can be divided into the following eight tectonic units (Fig. 6): the Zhanhua depression, the Kendong uplift, the Qingtuozi uplift, the Qingdong depression, the Dongying depression, the Guangrao uplift, the Weibei uplift, and the Laohe depression.…”

Section: Tectonic Featuresmentioning

confidence: 97%

Structural Interpretation of the Qingdong Area in Bohai Bay Basin from Shipborne Gravity Data

Zhang

Chen

Song

et al. 2015

Polish Maritime Research

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Section: Tectonic Featuresmentioning

confidence: 97%

Structural Interpretation of the Qingdong Area in Bohai Bay Basin from Shipborne Gravity Data

Zhang

Chen

Song

et al. 2015

Polish Maritime Research

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“…The sediments deposited at the synrift stage were restricted to the grabens and half grabens and were deposited in lacustrine environments. The postrift stage occurred during the deposition of the Guantao, Minghuazhen and Pingyuan Formations (Guo et al 2010).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Stable isotope analyses were carried out on samples of dolomites and calcites at different stratigraphic intervals (Guo et al 2010) and lithofacies, and the results are shown in Table 1. The d 13 C values of calcites from lime mudstone range from -2.13 to 1.99 % PDB during this time interval.…”

Section: Geochemistrymentioning

confidence: 99%

Formation of fine crystalline dolomites in lacustrine carbonates of the Eocene Sikou Depression, Bohai Bay Basin, East China

et al. 2016

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The genesis of the fine crystalline dolomites that exhibit good to excellent reservoir properties in the upper fourth member of the Eocene Shahejie Formation (Es 4 s ) around the Sikou Sag, Bohai Bay Basin, is uncertain. This paper investigates the formation mechanisms of this fine crystalline dolomite using XRD, SEM, thin section analysis and geochemical data. The stratigraphy of the Sikou lacustrine carbonate is dominated by the repetition of metre-scale, high-frequency deposition cycles, and the amount of dolomite within a cycle increases upward from the cycle bottom. These dolomite crystals are 2-30 lm in length, subhedral to anhedral in shape and typically replace both grains and matrix. They also occur as rim cement and have thin lamellae within ooid cortices. Textural relations indicate that the dolomite predates equant sparry calcite cement and coarse calcite cement. The Sr concentrations of dolomites range from 900 to 1200 ppm. Dolomite

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“…It consists of sublacustrine fan coarse-grained conglomerates, pebbly sandstones, sandstones, and lacustrine mudstones (Guo et al, 2010;Wang et al, 2014). Mature source rocks with Ro from 0.35 to 1.0% are present in the Es4s intervals (Song et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the objectives of this article are to (1) document the characteristics of carbonate cements, (2) determine the origin and distribution of the carbonate cements, and (3) evaluate the effect of the carbonate cements on petroleum reservoir quality. Guo et al, 2010); (b) Distribution of main sags and uplifts and major faults and location of section AA'; (c) Cross section AA' showing major statigraphic units and major tectonic features within the Dongying depression (modified from Guo et al, 2010). deposition, seasonal floods carried abundant siliciclastic sediments into the lake and large, sublacustrine fans developed adjacent to the footwall of the Chennan boundary fault and interfingered with more distal mudstones ( Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Origin of carbonate cements with implications for petroleum reservoir in Eocene sandstones, northern Dongying depression, Bohai Bay basin, China

Cao

Wang

et al. 2016

Energy Exploration & Exploitation

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The Eocene Es4s interval is an important petroleum reservoir of sublacustrine fan dominated at the depths of 2500-4000 m in Dongying depression, Bohai Bay basin. Based on core observation, three types of carbonate-cemented beds have been identified and commonly contain ferroan calcite and ankerite predominantly and less calcite and dolomite. Precipitation temperatures range from 34.6 to 72.8 C for calcite and dolomite cements, and from 110 to 153 C for ferroan calcite and ankerite cements. The high 13 C PDB values (À0.65 to +5.59%) for calcite and dolomite suggest that dissolved inorganic carbon, derived from methanogenic fermentation of organic matter in adjacent mudstones. The low 13 C PDB values (+1.04 to +3.29%) for ferroan calcite and ankerite probably indicate a mixture of carbon derived from decarboxylation of organic acid as well as from the dissolution of early formed carbonate cements. High plug porosity is mainly developed at the central section of sandstones vertically and the porosity decreases sharply toward the top and base of the sandstones due to extensively carbonate-cemented beds. The carbonate-cemented beds varies from 0.02 to 0.5 m in thickness and might extend from tens to hundreds meters laterally. It could be served as fluid-flow barriers and seals for petroleum, and result in reservoir deterioration and significant heterogeneity.

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Oil generation as the dominant overpressure mechanism in the Cenozoic Dongying depression, Bohai Bay Basin, China

Cited by 146 publications

References 59 publications

Structural Interpretation of the Qingdong Area in Bohai Bay Basin from Shipborne Gravity Data

Structural Interpretation of the Qingdong Area in Bohai Bay Basin from Shipborne Gravity Data

Formation of fine crystalline dolomites in lacustrine carbonates of the Eocene Sikou Depression, Bohai Bay Basin, East China

Origin of carbonate cements with implications for petroleum reservoir in Eocene sandstones, northern Dongying depression, Bohai Bay basin, China

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