Sequence stratigraphy, sedimentary facies and reservoir quality of Es4s, southern slope of Dongying Depression, Bohai Bay Basin, East China

Zahid, Muhammad Aleem; Dong, Changyin; Chen, Lin; Gluyas, Jon; Jones, Stuart J.; Zhang, Xianguo; Munawar, Muhammad Jawad; Ma, Cunfei

doi:10.1016/j.marpetgeo.2016.06.026

Cited by 65 publications

(26 citation statements)

References 51 publications

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“…The Bohai Bay Basin is one of the most important hydrocarbon provinces in East China [10,[30][31][32]. The Dongying Depression, located on south-eastern part of Bohai Bay Basin ( Figure 1A), is about 90 km long in an East-West direction and 65 km wide in a North-South direction, containing extensive hydrocarbon accumulations [33] ( Figure 1B).…”

Section: Regional Geologymentioning

confidence: 99%

Controls on Reservoirs Quality of the Upper Jurassic Mengyin Formation Sandstones in Dongying Depression, Bohai Bay Basin, Eastern China

Yang

Zhang

et al. 2020

Energies

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The Upper Jurassic Mengyin Formation sandstones are important targets for petroleum exploration in Dongying Depression of Bohai Bay Basin, Eastern China. Although the current burial depth of the Upper Jurassic Mengyin Formation sandstones is shallow (900–2500 m), the reservoir rocks are characterized by low porosity and low permeability due to the complex diagenetic modifications after deposition. Experimental tests and statistical methods, such as thin section, scanning electron microscopy (SEM), cathodoluminescence (CL), high pressure mercury injection (HPMI) and fluid inclusion analysis are conducted to delineate the mineralogical, petrographic and petro-physical characteristics. Results show that physical and chemical processes, including burial depth, burial and thermal history and pore fluid evolution, are both important for the diagenetic modifications that result in a variety changes in pore system and reservoir quality. According to numerical simulation of porosity evolution during lengthy burial and thermal history, porosity loss due to the early deep burial process under the high paleo-geothermal gradient can reach about 20%. Moreover, the burial history (effective stress and temperature) has a better guidance to reservoir quality prediction compared with current burial depth. The extensive compaction in sandstones also resulted in extremely low pore fluid flow during subsequent diagenetic processes, thus, the reaction products of dissolution cannot be removed, which would be precipitated as carbonate cements during stable reburial phase. Dissolution resulted from uncomformity-related meteoric flushing have been the most important porosity-enhancing factor in Mengyin Formation sandstones in spite of low thin section porosity averaged out to 3.22%. Secondary pores derived from dissolution of unstable silicates are more likely to develop in sandstones near the regional unconformity. The oil source fault activities may enhance the heterogeneity of reservoir rocks and control the reservoir quality by inducing micro-fractures and providing the main pathways for hydrocarbon migration.

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Section: Regional Geologymentioning

confidence: 99%

Controls on Reservoirs Quality of the Upper Jurassic Mengyin Formation Sandstones in Dongying Depression, Bohai Bay Basin, Eastern China

Yang

Zhang

et al. 2020

Energies

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“…In poorly exposed areas, well logging is extremely useful as it largely reflects the composition of the rocks. The E 3 s 2 sequence is easily recognizable on seismic profiles (Dai, 2008;Zahid et al, 2016). The seismic interface characteristic of T4 is a weak reflection between two strong reflection events; it is the top reflection of the E 3 s 2 sequence, which is the dividing line between E 3 s 1 and E 3 s 2 .…”

Section: Sequence Boundarymentioning

confidence: 99%

Sedimentology of the deltaic Paleogene Shahejie Formation in the D‐1 area of Liaodong Bay, East China

et al. 2020

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The Liaodong Bay area in northeast China has abundant hydrocarbon resources. The study area (referred to as D-1) is located in the southeast portion of the Liaodong Graben, a tectonic unit of Liaodong Bay, where the focus for exploration is on sandstone units in the Palaeogene Shahejie Formation. Here, hydrocarbons with an oil production capacity of 629 m 3 /day have been discovered in well D-1-2SA. The reservoir facies have been analysed by combining the cuttings, logging, seismic data, sedimentary facies, and sequence stratigraphy. In the sequence stratigraphic study, the second member from the base of the formation is divided into one third-and four fourth-order depositional sequences. The sedimentary facies include fan deltaic, braided river deltaic, and lagoonal systems. Seismic attribute inversion of the sequence framework, depositional models, and sediment distribution has been conducted for each system tract. The reservoirs facies in the D-1 area are characterized by medium to low porosity, and medium to low permeability. The development of reservoirs facies is related to the subaqueous depositional channels of the fan deltaic system with the best quality for hydrocarbon storage. These channels have strong root mean square amplitudes used for seismic attribute identification for reservoir targets. The formations of the source-to-sink system with granitic and metamorphic source rocks and relative distant transportation are considered to have the best potential for hydrocarbon reservoirs.

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“…3. The lithology and general sequence stratigraphic charts of the Jiyang sub-basin (modified from Feng et al, 2013 andZahid et al, 2016).…”

Section: Mf3 (Microfacies 3) Unit: Silty-claystonementioning

confidence: 99%

“…The classification of different sequence order is based on Feng et al (2013) and Zahid et al (2016); lake level is based on Feng et al (2013) and modified from detailed interpretation from this study. The ages of the sequence boundaries are derived from Feng et al (2013).…”

Section: Mf3 (Microfacies 3) Unit: Silty-claystonementioning

confidence: 99%

Wave-Enhanced Sediment-Gravity Flows in Bohai Bay Lacustrine Basin, Eastern China

Bai

Dong

et al. 2018

Acta Geologica Sinica - English Edition

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Sequences of wave‐enhanced sediment‐gravity flows (WESGFs) have been widely recognized in the marine shelf environment. In this study, we show observations of WESGF deposits in lacustrine settings using well core and thin section data from the Paleogene in the Jiyang sub‐basin, Bohai Bay basin, eastern China. The findings of this study include the following: 1) the sequence of WESGFs in the lacustrine basin is similar to that of marine; it consists of three units, MF1 unit: siltstone with basal erosion surface, MF2 unit: silt‐streaked claystone, and MF3 unit: silty‐mudstone; and 2) prodelta sand sheets are found in the lacustrine WESGF sequence and are classified as the MFd unit: clay‐streaked siltstone. However, because the system size and variability in hydrodynamic conditions are different between the lacustrine and marine basins, lacustrine WESGFs do appear to have three distinguishable features: 1) the sediment grain size and sand content are slightly higher than those of the marine WESGFs; 2) lacustrine WESGFs may contain prodelta sediments or sedimentary sequences of other types of gravity flows, such as hyperpycnal flows; and 3) the scale of the sedimentary structures for lacustrine WESGFs is smaller. The WESGFs found in the continental lacustrine basin provide a new model for sediment dispersal processes in lake environments and may be helpful to explain and predict the distribution of sandy reservoirs for oil and gas exploration.

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Sequence stratigraphy, sedimentary facies and reservoir quality of Es4s, southern slope of Dongying Depression, Bohai Bay Basin, East China

Cited by 65 publications

References 51 publications

Controls on Reservoirs Quality of the Upper Jurassic Mengyin Formation Sandstones in Dongying Depression, Bohai Bay Basin, Eastern China

Controls on Reservoirs Quality of the Upper Jurassic Mengyin Formation Sandstones in Dongying Depression, Bohai Bay Basin, Eastern China

Sedimentology of the deltaic Paleogene Shahejie Formation in the D‐1 area of Liaodong Bay, East China

Wave-Enhanced Sediment-Gravity Flows in Bohai Bay Lacustrine Basin, Eastern China

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