Characteristics of hydrothermal activity in the Tarim Basin and its reworking effect on carbonate reservoirs

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

“…These observations suggest intense fluid activity which had a dominant influence on the precipitation of calcite during the carbonate diagenesis (cementation) in the fault damage zones. This is consistent with the documented extensive, hydrothermal activity during the Permian throughout the Tarim Basin [48,49]. Almost all of the porosity in the first and second fractures has been occluded by strong precipitation of calcite cements during deep burial environment ( Figures 6 and 7).…”

“…Together with the macro-and micro-structures observed in the Halahatang area Ordovician carbonates [28,40,[48][49][50], there are multiple features that evidence the complicated structural control upon diagenesis rather than that which typifies the relatively uniform diagenesis of the carbonate country rocks unaffected by faulting ( Table 1). The fracture elements present and production data [30] have shown the structure-related diagenesis is constrained to within the fault damage zones, or their immediate vicinity, with those rocks productivity controlled by the fault activities.…”

“…The fracture elements present and production data [30] have shown the structure-related diagenesis is constrained to within the fault damage zones, or their immediate vicinity, with those rocks productivity controlled by the fault activities. Previous studies have shown that the Ordovician limestones in the Tarim Basin have undergone more than 10 generations of diagenesis in the submarine, eogenetic and mesogenetic environments [28,40,[48][49][50]. In these studies, multiple episodes of fracture activity and/or hydrothermal activity evidenced in the Ordovician carbonates are correlated to fault activities in the Tarim Basin [28,49,51].…”

Influence on the oil‐gas accumulation potential of the laminated algal micritic dolomite in Jixian system from Mesozoic magmatic activities at the south‐western margin of the Ordos Basin, China

“…Variations of pyrolysis parameters in Jixian System with increasing distance from the intrusion also be rich with transition metal elements (Dekov et al, 2014;Mango, 1992). And affected by hydrothermal fluid, the characteristics of trace elements and REE in carbonates would obviously alter (Jiang, Hou, Xing, Xu, & Li, 2016;Li et al, 2016;Liu, Huang, et al, 2016;Wang, Shen, Chen, Yang, & Wang, 2011). As seen in Figure 6, it reflects that ΣREE (Figure 6a), the content of transition metal elements (V + Ni + Co + Cr; Figure 6b), the content of Sr (Figure 6c), the content of Ba (Figure 6d), and Sr/Ba value (Figure 6e) are decreasing, with the obvious change in the range of 0-15 m. In addition, the dolomite of Jixian System and the Tongcheng intrusion have a relative consistency in the REE composition and distribution pattern (Weng et al, 2012).…”

“…In recent years, with the enlargement of exploration fields, the exploration of volcanic reservoirs, found in more than 300 volcanic‐sedimentary basins around 20 countries, has made a breakthrough in the world, for example, the Songliao Basin and the Bohai Bay Basin of China (Archer, Bergman, Iliffe, Murphy, & Thornton, ; Huang, Wang, & Chen, ; Kang, ; Kuang et al, ; Li et al, ; Luo, Gong, Sun, Wang, & Qi, ; Wang, Li, Shi, Zhao, & Ma, ; Zou et al, ). Meanwhile, geologists gradually gain the knowledge of the hydrocarbon generation and expulsion, organic matter enrichment, and reservoir reconstruction accompanying with magmatic activities (Gao, Gao, & Zhao, ; Kato et al, ; Liu, Huang, Wang, Shi, & Jiang, ; Xu et al, ; Zhang et al, ). Thus, the idea that magmatic activities have dual influences on formation and distribution of oil and gas in the sedimentary basins is well known recently.…”