Identification of sedimentary-diagenetic facies and reservoir porosity and permeability prediction: An example from the Eocene beach-bar sandstone in the Dongying Depression, China

Wang, Jian; Cao, Yingchang; Liu, Keyu; Liu, Jie; Kashif, Muhammad

doi:10.1016/j.marpetgeo.2017.02.004

Cited by 66 publications

(22 citation statements)

References 30 publications

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“…The total evaluation score is the result of multiplying all five controlling factors by 0.2 and adding them. To indicate the diagenetic intensity of compaction, cementation and dissolution, a classification standard in the study area is defined by Pcompaction, Pcementation and Pdissolution (Wang et al 2017) (Table 4). When the Pcompaction, Pcementation and Pdissolution value of a reservoir is greater than 70%, we define it as "Strong".…”

Section: Classifications Of Reservoirsmentioning

confidence: 99%

A comprehensive analysis of the sedimentology, petrography, diagenesis and reservoir quality of sandstones from the Oligocene Xiaganchaigou (E3) Formation in the Lengdong area, Qaidam Basin, China

Wang

Zhang

et al. 2018

J Petrol Explor Prod Technol

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The sandstone from the Oligocene Xiaganchaigou Formation (E 3) in the Lengdong area, Qaidam Basin, China, is extensively distributed and acts as an effective regional reservoir for hydrocarbon accumulation. Based on thin sections, scanning electron microscopy (SEM), X-ray diffraction (XRD) image analysis and cathodoluminescence (CL), a comprehensive analysis of the sedimentology, petrography, diagenesis and reservoir quality of the Oligocene sandstone reservoirs of the Xiaganchaigou (E 3) Formation in the Lengdong area, Qaidam Basin, are studied. The sandstones in the Lengdong area are classified as argillaceous sandstone, silty sandstone, fine sandstone, medium sandstone, pebbly sandstone, conglomeratic sandstone and conglomerate based on their grain sizes, degrees of sorting, and matrix contents. Five sedimentary facies were identified in the Xiaganchaigou Formation (E 3) of the Lengdong area, Qaidam Basin: distributary channel, interdistributary bay, mouth bar, central bar and distal sand sheet facies. Their major diagenetic processes include compaction, carbonate cementation and feldspar and calcite cement dissolution. The porosity and permeability values of the fine sandstone, conglomerate, and conglomeratic sandstone are the highest, followed by those of the medium sandstone and silty sandstone, and the argillaceous sandstone and pebbly sandstone have the lowest porosity and permeability values. The diagenetic sequence in the study area ranges from the eodiagenesis B stage to the mesodiagenetic A stage. Compaction has significantly reduced the primary porosity. Carbonate cements, mainly calcite cements, occlude pores by precipitating in intergranular and intragranular spaces. Dissolution largely contributes to increasing the secondary porosity. The well-sorted and relatively coarser-grained sandstones that formed in higher-energy sedimentary facies (distributary channel, mouth bar and central bar) have a better reservoir quality than the poorly sorted, clay-rich sandstones that formed in low-energy environments (interdistributary bay and distal sand sheet). Based on the comprehensive analysis of petrographic data, diagenesis and sedimentary facies, the reservoir in the Lengdong area is classified into three types: type A, type B and type C. Type A, located in the center of the study area, is the most favorable reservoir, while type C sandstone is the last to consider when looking for a good reservoir. This study can guide hydrocarbon exploration in the Lengdong area, as well as in northwestern China and similar areas throughout the world.

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Section: Classifications Of Reservoirsmentioning

confidence: 99%

A comprehensive analysis of the sedimentology, petrography, diagenesis and reservoir quality of sandstones from the Oligocene Xiaganchaigou (E3) Formation in the Lengdong area, Qaidam Basin, China

Wang

Zhang

et al. 2018

J Petrol Explor Prod Technol

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“…The porosity and permeability have close relation with the original composition and structure, which is controlled by sedimentary facies (Abdullah A. Z., Howard D. J., 2013;Jian Wang, Yingchang Cao, et al, 2017). It is found that sedimentation is a basic factor for generating low permeability reservoirs, and the strong compaction and cementation are the key factors for forming low porosity and low permeability reservoirs.…”

Section: Sedimentation and Diagenesis And Effects On Reservoirsmentioning

confidence: 99%

“…At present, the numerical simulation methods fall into two major categories. The first category is based on physical or chemical model, which use single factor model to simulate the effect of diagenesis on pores while the other one only considers the comprehensive results of diagenesis on pores, but not caring about concrete diagenesis (Zhang Jinliang, et al, 2013;Jian Wang, Yingchang Cao, et al, 2017). In our study we firstly simulate the effect of different diagenesis on pores in burial history, and then a synthetic equation model was established, which can be used to compute the porosity of clastic reservoirs, particularly on reservoirs with low porosity and low permeability.…”

Section: Reservoir Predictionmentioning

confidence: 99%

Forming Condition and Geology Prediction Techniques of Deep Clastic Reservoirs

Qian

Yin

Zhang

et al. 2017

Acta Geologica Sinica (Eng)

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“…Therefore, understanding the impact of diagenesis on reservoir quality is critical to hydrocarbon exploration and production (Khalifa & Morada, ). In addition, diagenetic facies, which is the integration of diagenesis, diagenetic minerals, and pore systems (Cui et al, ; Lai, Wang, Wang, et al, ; Liu, Zhao, Luo, Chen, & He, ; Wang, Cao, Liu, Liu, & Kashif, ; Zeng, Zhu, Zhu, & Zhang, ; Zou et al, ), can be defined by studies of thin sections, cathodoluminescence, X‐ray diffraction, SEM, and conventional well logs (Liu et al, ; Wang, Cao, et al, ) and are widely used for predicting “sweet spots” in low‐permeability sandstones (Cui et al, ; Lai et al, ; Zeng et al, ; Zou et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Further petrographic analysis confirms that the dissolution only takes place in feldspars.4.4 | Diagenetic facies and their calibrations with well logsDiagenetic facies is the comprehensive description of diagenesis type and degree and diagenetic minerals(Cui et al, 2017;Lai, Wang, Cai, et al, 2018;Lai, Wang, Ran, et al, 2016;Liu et al, 2015;Ozkan, Cumella, Milliken, & Laubach, 2011;Rushing, Newsham, & Blasingame, 2008;. Diagenetic facies may be called lithofacies or sedimentary-diagenetic facies in some cases when taking the depositional attributes into consideration(Lai, Wang, Chai, et al, 2017;Wang, Cao, et al, 2017). Well logs and diagenetic facies from petrographic analysis were employed to distinguish diagenetic facies in the Es3 sandstones, with five major diagenetic facies being identified by systematic description of the petrographic features for the purposes of reservoir quality evaluation and prediction.Diagenetic Facies A is a unit rich in quartz-cemented sandstone and tends to be the most detrital quartz rich.…”

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confidence: 99%

Diagenesis and reservoir quality of sandstones in the Eocene Shahejie Formation, Raoyang Sag (Jizhong Depression), Bohai Bay Basin, China

et al. 2019

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Deeply buried (3.5–4.5 km) fan deltaic and braided deltaic sandstones of the Eocene Shahejie Formation are important hydrocarbon reservoirs in the Raoyang Sag of the Bohai Bay Basin (North China). An integrated approach incorporating petrophysics, thin‐section petrography, scanning electron microscope (SEM), cathodoluminescence (CL), and well log analysis was applied to investigate diagenesis, diagenetic minerals, and their impacts on reservoir quality. The sandstones of the Sha‐3 (the third Member of the Shahejie Formation) are dominated by lithic arkoses and arkoses with a low‐moderate compositional maturity and a moderate textural maturity. The pore systems are dominated by secondary pores resulting from dissolution of framework grains, micropores among authigenic clays, and minor amounts of primary intergranular pores. Chemically unstable framework grains such as feldspar and lithic fragments experienced alteration and resulted in formation of authigenic kaolinite. Dissolution and alteration of feldspars and rock fragments and pressure solution of detrital quartz grains were the main sources for quartz cements. Mechanical compaction and cementation by calcite, dolomite, quartz, kaolinite, and mixed‐layer illite/smectite destroyed primary pores, whereas dissolution of framework grains generated secondary pores. Five types of diagenetic facies are identified based on framework mineralogy, texture, diagenetic minerals, and pore systems. These comprise the following: (a) quartz‐cemented sandstone, (b) tightly compacted sandstone, (c) carbonate‐cemented sandstone, (d) clay‐mineral‐cemented sandstone, and (e) clean dissolved sandstone. Diagenetic processes and evolution sequences for the five diagenetic facies were reconstructed based on textural relationships from thin section, SEM, and CL studies. The reservoir quality evolution of various diagenetic facies is predicted by considering variations in grain size, sorting, shape, and matrix content of sandstones. This work, which investigates the diagenetic sequence of sandstones, will provide insights into reservoir quality prediction for low‐permeability sandstones with similar tectono‐depositional settings.

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Identification of sedimentary-diagenetic facies and reservoir porosity and permeability prediction: An example from the Eocene beach-bar sandstone in the Dongying Depression, China

Cited by 66 publications

References 30 publications

A comprehensive analysis of the sedimentology, petrography, diagenesis and reservoir quality of sandstones from the Oligocene Xiaganchaigou (E3) Formation in the Lengdong area, Qaidam Basin, China

A comprehensive analysis of the sedimentology, petrography, diagenesis and reservoir quality of sandstones from the Oligocene Xiaganchaigou (E3) Formation in the Lengdong area, Qaidam Basin, China

Forming Condition and Geology Prediction Techniques of Deep Clastic Reservoirs

Diagenesis and reservoir quality of sandstones in the Eocene Shahejie Formation, Raoyang Sag (Jizhong Depression), Bohai Bay Basin, China

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