The diagenetic controls of the reservoir heterogeneity in the tight sand gas reservoirs of the Zizhou Area in China's east Ordos Basin: Implications for reservoir quality predictions

Mi, Li; Guo, Yinghai; Li, Zhuangfu; Wang, Huaichang

doi:10.1016/j.marpetgeo.2019.104088

Cited by 23 publications

(18 citation statements)

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“…Previous studies have showed that finegrained sandstones may suffer dense compaction (Li et al, 2017). Also, large amounts of ductile grains, such as clays and certain volcanic rock fragments, may lead to a greater degree of compaction (Li, Guo, Li, & Wang, 2020;Rahman & Worden, 2016;Worden & Morad, 2000) (Figure 12). As is shown in Figure 13, IGV decreases with the increase of the content of ductile fragments.…”

Section: Petrographic Characteristics Control On Diagenesismentioning

confidence: 97%

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Impact of petrographic characteristics on reservoir quality of tight sandstone reservoirs in coal‐bearing strata: A case study in Lower Permian Shihezi Formation in northern Ordos Basin, China

Liu

et al. 2021

Geological Journal

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The lower Shihezi Formation in the Sulige gas field is the main gas exploitation target in the Ordos Basin and is crucial in finding high-quality reservoirs for further exploration.Using X-ray diffraction, cathodoluminescence (CL), and scanning electron microscope (SEM) techniques, the eighth member of lower Shihezi Formation (He8) sandstones are characterized as fine-to coarse-grained quartzarenite and litharenite with good sorting, which are controlled by different sources and depositional faces. Four types of sandstones are recognized according to varied petrographic characteristics, among which fine-grained sandstones (type I) has the poorest reservoir quality and coarse-grained sandstones with chlorite coating (type II) are the best reservoirs. The complicated diagenetic process mainly includes intense compaction, two-stage dissolution, quartz and calcite cementation, which is closely associated with the thermal evolution of coals. The increased ductile fragments account for low reservoir quality in type I sandstones. Due to the absence of feldspar, the influence of other detrital components on the reservoir quality has increased. Sandstones with abundant volcanic fragments (type II) usually formed grain-coating chlorite, which inhibit tight compaction and quartz cementations.Quartz overgrowth originated from feldspar dissolution as well as pressure dissolution of detrital quartz are frequently observed in medium-to coarse-grained quartzarenite (type III). The high-quality reservoir exits when the ductile grains content is about 4%, according to the negative relationship between quartz cement and ductile content.Although there are a lot of dissolution pores in medium-to coarse-grained litharenite (type IV), the reservoir quality did not improve much due to the diagenetic minerals filling in the secondary pores. K E Y W O R D S coal-bearing strata, diagenesis, Ordos Basin, petrographic characteristics, quartz cementation, tight gas reservoir 1 | INTRODUCTION Tight sandstone reservoirs in coal-bearing strata are gradually receiving much interest because of their large hydrocarbon reserves worldwide (Zou et al., 2012). In China, the production of gas in coal buried strata has reached 902 × 10 8 m 3 , accounting for 61.5% of the total production (Zou et al., 2019). Therefore, it is very significant to focus on factors affecting production in coal buried tight sandstones.

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Section: Petrographic Characteristics Control On Diagenesismentioning

confidence: 97%

“…The types and degrees of diagenesis during eodiagenesis play a significant role in subsequent alterations and reservoir evolution (Li et al, 2020;Mansurbeg et al, 2008;Wang & Mou, 2013). The main diagenetic events are as follows: (1) mechanical compaction;…”

Section: Eodiagenesismentioning

confidence: 99%

Impact of petrographic characteristics on reservoir quality of tight sandstone reservoirs in coal‐bearing strata: A case study in Lower Permian Shihezi Formation in northern Ordos Basin, China

Liu

et al. 2021

Geological Journal

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“…The spatial distribution of different types of diagenetic facies is a key problem in the evaluation of the tight sandstone reservoirs. Traditional diagenetic facies prediction is based on reservoir parameters such as thickness, porosity, and permeability (Zou et al, 2008;Hao et al, 2010;Lai et al, 2013;Guo et al, 2019;Li et al, 2020;Qiao et al, 2020). However, there is a problem of low accuracy under the influence of reservoir heterogeneity.…”

Section: Distribution Regularity Of Diagenetic Faciesmentioning

confidence: 99%

“…The evaluation and prediction of the tight sandstone reservoirs have been hotspots for the petroleum industry (Guo et al, 2019;Ren et al, 2019;Xiao et al, 2019;Li et al, 2020). The actual exploration effect of the traditional method for the evaluation of tight sandstone reservoirs is poor, which is mainly because the fact that the reservoir physical parameters can not reflect the strong heterogeneity of tight sandstone reservoir (Nian et al, 2016;Zhu et al, 2016;Zhou et al, 2019;Qiao et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Rapid quantitative evaluation of diagenesis based on diagenetic facies study is the most widely used now and will be the major methodology (Jiang et al, 2014;Zhu et al, 2016;Cui Y et al, 2017). Diagenetic facies including mineral constituents, cement, fabric, pores, and fractures, which reflects the current mineral composition and fabric features and is the genetic mark representing reservoir nature, type, and quality, is the result of sediments which underwent diagenesis and a period of diagenetic evolution (Zou et al, 2008;Li et al, 2019;Li et al, 2020). Diagenetic facies study focusing on the effects of diagenesis process on reservoir properties and pore configuration (Ochoa, 2010;Cui et al, 2017;Lai et al, 2018) is to effectively help hydrocarbon exploration and development by determining the spatial distribution of high-quality reservoir to provide reliable evidence for reservoir prediction (Maast et al, 2011;Meng et al, 2015;Li et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Evaluation of Tight Sandstone Reservoir Based on Diagenetic Facies—A Case of Lower Silurian Kepingtage Formation in Shuntuoguole Low Uplift, Tarim Basin, China

Zhang²,

Xia

et al. 2021

Front. Earth Sci.

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The tight sandstone reservoirs of the Lower Silurian Kepingtage Formation are important exploratory targets for tight gas resources in the Shuntuoguole Low Uplift of Tarim Basin. How to evaluate tight sandstone reservoir is an urgent problem to be solved. In this study, we investigated the effects of diagenesis on the heterogeneity of tight sandstone deposits in similar sedimentary facies and established the relationship between the diagenetic facies and reservoir quality. Cores of the tight sandstone reservoirs of Lower Silurian Kepingtage Formation in Shuntuoguole Low Uplift are studied with thin section observation, SEM, XRD, and mercury injection. Quantification of diagenesis influencing porosity suggests that sandstone densification is mainly controlled by compaction, cementation, and hydrocarbon charging (bitumen charging), and the reservoir properties are effectively improved by dissolution, based on which 6 types of diagenetic facies are classified. Interpretation of the log data from individual wells with “K nearest neighbor” algorithm concludes that top and base of the upper member of Kepingtage Formation are believed to have favorably diagenetic reservoirs mainly falling in Type V; favorably diagenetic facies develop best in the lower member of Kepingtage Formation predominated by Types V and VI which mainly distribute in its top. Composite analysis of diagenetic facies, sedimentary facies, and porosity distribution shows that the favorable area of further exploration and development is east of Well SH903 and north of Well SH10. The quantitative identification of diagenetic facies based on logging information can provide reasonable results for the evolution of the tight sandstone reservoirs for a similar area in the Tarim Basin.

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Depositional process and its control on the densification of coal-measure tight sandstones: insights from the Permian Shanxi Formation of the northeastern Ordos Basin, China

Chen

Zhao

Guo

et al. 2023

Int J Earth Sci (Geol Rundsch)

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The diagenetic controls of the reservoir heterogeneity in the tight sand gas reservoirs of the Zizhou Area in China's east Ordos Basin: Implications for reservoir quality predictions

Cited by 23 publications

References 42 publications

Impact of petrographic characteristics on reservoir quality of tight sandstone reservoirs in coal‐bearing strata: A case study in Lower Permian Shihezi Formation in northern Ordos Basin, China

Impact of petrographic characteristics on reservoir quality of tight sandstone reservoirs in coal‐bearing strata: A case study in Lower Permian Shihezi Formation in northern Ordos Basin, China

Quantitative Evaluation of Tight Sandstone Reservoir Based on Diagenetic Facies—A Case of Lower Silurian Kepingtage Formation in Shuntuoguole Low Uplift, Tarim Basin, China

Depositional process and its control on the densification of coal-measure tight sandstones: insights from the Permian Shanxi Formation of the northeastern Ordos Basin, China

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