Diagenesis and origin of porosity formation of Upper Ordovician carbonate reservoir in northwestern Tazhong condensate field

Zhang, Heng; Cai, Zhongxian; Liu, Qi; Liu, Yun

doi:10.1016/j.jngse.2016.12.008

Cited by 17 publications

(26 citation statements)

References 29 publications

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“…The Ordovician country rocks, in the deep subsurface (>6000 m), exhibit evidence of strong compaction with line and edge contacts among the mineral grains in the carbonates (Figure 4a) [28,40]. In the fault damage zones, some thin sections show floating and point contacts of the grainstones (Figure 4b), and point and line contacts in other grainstones (Figure 4c).…”

Section: Compaction and Pressure Solutionmentioning

confidence: 99%

“…The primary porosity of the Halahantang area Ordovician carbonate rocks is almost completely occluded (Figures 4 and 6a) [28,40]. The secondary porosity in fractures and vugs is also filled mainly by calcite cements and some bitumen ( Figure 6).…”

Section: Cementationmentioning

confidence: 99%

“…The country rocks are characterized by fine-grained, thin, equidimensional cements (C1-1) surrounding the grains, and coarser, equant, granular cements (C1-2) that infilled in the intergranular porosity ( Figure 6a). The fine cements coating the grains are assumed to have occurred in a marine diagenetic environment [28,40]. As such, there were possibly multiple cementation generations affecting the intergranular porosity of the Ordovician carbonate in the Tarim Basin [40], but herein we only discuss those that are related to fault activity.…”

Section: Cementationmentioning

confidence: 99%

“…The fine cements coating the grains are assumed to have occurred in a marine diagenetic environment [28,40]. As such, there were possibly multiple cementation generations affecting the intergranular porosity of the Ordovician carbonate in the Tarim Basin [40], but herein we only discuss those that are related to fault activity. In the fault damage zones, there were generally observed 2-4 generations of calcite cement [28] ( Figure 6).…”

Section: Cementationmentioning

confidence: 99%

“…The primary porosity of the Ordovician carbonate rocks from the Halahatang area has been almost totally occluded during burial diagenesis [28,40]. Reservoir porosity is primarily the result of dissolution [28,30,33,34].…”

Section: Dissolutionmentioning

confidence: 99%

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Structural Diagenesis in Carbonate Rocks as Identified in Fault Damage Zones in the Northern Tarim Basin, NW China

Xie

Zhang

et al. 2019

Minerals

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The identification of structural diagenesis and the reconstruction of diagenetic paragenesis in fault damage zones is important for understanding fault mechanisms and fluid flow in the subsurface. Based on the examination of core and sample thin section data, we deciphered the diagenetic parasequence and their fault controls for Ordovician carbonates in the northern Tarim intracratonic basin in NW China (Halahatang area). In contrast to the uniform nature of diagenesis observed in country rocks, there is a relatively complicated style of compaction and pressure solution, multiple fracturing, and cementation and dissolution history along the carbonate fault damage zones. The relative paragenetic sequence of the structure related diagenesis suggests three cycles of fracture activities, following varied fracture enlargement and dissolution, and progressively weaker calcite cementation. These processes of structure related diagenesis are constrained to the fault damage zones, and their variation is affected by the fault activities. The results of this study suggest that the carbonate reservoir and productivity could be impacted by the structure related diagenesis locally along the fault damage zones.

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Section: Compaction and Pressure Solutionmentioning

confidence: 99%

Section: Cementationmentioning

confidence: 99%