Simulation for the dissolution mechanism of Cambrian carbonate rocks in Tarim Basin, NW China

Peng, Jun; Wang, Xuelong; Han, Haodong; Yin, Shuo; Xia, Qingsong; Li, Bin

doi:10.1016/s1876-3804(18)30048-x

Cited by 22 publications

(16 citation statements)

References 13 publications

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“…This law is reflected in the changes in the concentration sum of and (Table 4). In previous studies, the limestone dissolution capability of acid fluid first increases and then decreases [5,27]. Therefore, the range of [80 °C, 18 MPa-120 °C, 30 MPa] is the best temperature and pressure range for organic acid dissolution.…”

Section: Dissolution Simulation Experiments Under Burial Conditionsmentioning

confidence: 96%

“…Peng et al discussed the limestone dissolution mechanism through a dissolution simulation experiment and controlled selective dissolution by mineral composition and reservoir space types of limestone. The limestone dissolution capability of acid fluid initially increases and then decreases, thereby exhibiting an optimal temperature and pressure range for limestone dissolution [27]. Shou et al studied the reconstruction effect of limestone dissolution under strata conditions and relevant controlling factors through a simulation experiment of seepage and reaction of fluids in pores-fractures of rocks.…”

Section: State Of the Artmentioning

confidence: 99%

“…Therefore, the range of [80 °C, 18 MPa-120 °C, 30 MPa] is the best temperature and pressure range for organic acid dissolution. This range is known as the limestone dissolution window [27,38,39]. In the range of [80 °C, 18 MPa-160 °C, 42 MPa], the mass change rate and and concentrations in dolomite and lime-dolomite are generally higher than those in ooid-limestone, limestone, and dolomite limestone.…”

Section: Dissolution Simulation Experiments Under Burial Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Water-Rock Simulation During Limestone Dissolution

Zhang¹,

Wen²,

Qu³

et al. 2019

JESTR

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Limestone reservoir plays a vital role in global oil and gas distribution. Many studies on limestone dissolution have been reported, which mainly emphasize on the main controlling factors of limestone dissolution and reservoir formation mechanism. However, few studies have been conducted on limestone dissolution laws, and a general understanding of limestone dissolution under supergene and burial conditions is lacking. A water-rock simulation experiment was conducted by using five typical Lower Paleozoic limestones in Zhuanghai area of Jiyang depression of China to study limestone dissolution laws under supergene and burial conditions. Sample characteristics were observed by scanning electron microscopy, and limestone dissolution was investigated by inductively coupled plasma optical emission spectrometer (ICP-OES). Results show that the erosion rate of limestone is higher than that of dolomite under supergene condition (22 °C and 1.0 MPa). Limestone has selective corrosion in structure and components. Calcite is generally manifested as a "corroded crystalline cone," and dolomite generally presents "honeycomb-shaped" corrosion. Under burial conditions, the erosion rate of limestone first increases, decreases, and finally increases in the range of [80 °C, 18 MPa-160 °C, 42 MPa]. In the range of [120 °C, 30 MPa-160 °C, 42 MPa], the erosion rate of dolomite gradually becomes higher than that of calcite, and the erosion of dolomite dominates. Dolomite easily forms secondary pores and high-quality reservoirs than limestone. In this study, the general laws of limestone dissolution were investigated, and conclusions provide references to evaluate high-quality limestone reservoirs.

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Section: Dissolution Simulation Experiments Under Burial Conditionsmentioning

confidence: 96%

Section: State Of the Artmentioning

confidence: 99%

Section: Dissolution Simulation Experiments Under Burial Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Water-Rock Simulation During Limestone Dissolution

Zhang¹,

Wen²,

Qu³

et al. 2019

JESTR

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“…The δ 13 C PDB from seawater varies from 0 to 3‰ [38]. The oxygen isotope (δ 18 O PDB ) in carbonate cement is related to the formation temperature, the source of sedimentary fluid, and the diagenetic reformation in the later period [39]. Based on the types and characteristics of carbonate cement analysis, the measured carbon and oxygen isotope values of carbonate cement in the first and second AHPZs of the Baodao 19-B structure belt are shown in Table 2.…”

Section: Meteoricmentioning

confidence: 99%

“…The physical and chemical properties (such as acid, alkali, temperature, pressure, and components) of the fluid affect the reservoir diagenesis and control fluid-rock interaction. The fluids affecting the reservoir can be divided into organic and carbonic acid fluids [11,12], meteoric water [13,14], thermal fluids [15], H 2 S generated by thermochemical sulfate reduction (TSR) [16], H + released by clay mineral conversion [17], acid generated by biodegradable hydrocarbons [18], and alkaline fluids [19]. Most AHPZs that developed in sedimentary basins are the result of the comprehensive superposition of different factors.…”

Section: Introductionmentioning

confidence: 99%

Coupling Relationship between Multistage Fluid Activity and Reservoir Abnormally High-Porosity Zones in the Songtao–Baodao Region, Qiongdongnan Basin

Chen

Wang

2021

Geofluids

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An abnormally high-porosity zone (AHPZ) is beneficial for petroleum exploration, especially for the deep tight reservoirs in a petroliferous basin. Because of lacking effective research methods, it is hard to analyze the formation process of AHPZs in different geological periods. From the perspective of the diagenetic fluid type and activity history, geochemical characteristics and fluid inclusions of diagenetic minerals were utilized to reconstruct the diagenetic fluid type and dynamic evolution. The ultimate goal is to study the genetic process of AHPZs in the Songtao–Baodao region of the Qiongdongnan basin, South China Sea. It was found that there are three sections of AHPZs at different burial depths, which are generally favorable for high-quality reservoirs. Moreover, it can be concluded that the AHPZs are closely related to multiple actions of various diagenetic fluids. The meteoric waters, organic acid, and thermal fluids facilitated the enlargement of porosity by dissolving minerals to form secondary pore spaces. The hydrocarbon fluids have positive effects on the preservation of pores by preventing cement from filling the pore space.

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Lithofacies and reservoirs in sequence stratigraphic framework of Lower Palaeozoic carbonate, offshore Bohai Bay Basin, eastern China

Chen

Niu

et al. 2022

Geological Journal

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A set of marine carbonates was deposited in the Palaeozoic of the North China Craton, which is the dominant sequence for buried hill hydrocarbon exploration. This study focuses on the lithofacies and reservoirs developed in the sequence. Based on the data of cores, thin sections, drilling, and logging, the characteristics of the sequence stratigraphic framework and its control on lithofacies and reservoirs of the Lower Palaeozoic buried hills in the offshore Bohai Bay Basin are discussed.The results show that there developed 4 second-order sequences and 21 third-order sequences in the study area. Due to the deep burial depth, the dolomite is more likely to form high-quality reservoirs than limestone in the study area, and we define the dolomitic tidal flat-dominant sequences as 'favorable reservoir sequences'. There developed unconformity-related reservoirs and inner reservoirs in the buried hill, and the 'favourable reservoir sequences' present obvious control on both reservoirs, showing: (i) 'favourable reservoir sequences' and weathering interface control on the scale of the unconformity-related reservoir jointly, and (ii) the inner reservoirs developed within 'favourable reservoir sequences' as well, and the top and bottom of the high-frequency sequences are the predominant areas for the bedding karst reservoir distribution.

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Simulation for the dissolution mechanism of Cambrian carbonate rocks in Tarim Basin, NW China

Cited by 22 publications

References 13 publications

Water-Rock Simulation During Limestone Dissolution

Water-Rock Simulation During Limestone Dissolution

Coupling Relationship between Multistage Fluid Activity and Reservoir Abnormally High-Porosity Zones in the Songtao–Baodao Region, Qiongdongnan Basin

Lithofacies and reservoirs in sequence stratigraphic framework of Lower Palaeozoic carbonate, offshore Bohai Bay Basin, eastern China

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