The SB1 strike-slip fault zone, which developed in the north of the Shuntuo Low Uplift of the Tarim Basin, plays an essential role in reservoir formation and hydrocarbon accumulation in deep Ordovician carbonate rocks. In this research, through the analysis of high-quality 3D seismic volumes, outcrop, drilling and production data, the hydrocarbon-bearing characteristics of the SB1 fault are systematically studied. The SB1 fault developed sequentially in the Paleozoic and formed as a result of a three-fold evolution: Middle Caledonian (phase III), Late Caledonian–Early Hercynian and Middle–Late Hercynian. Multiple fault activities are beneficial to reservoir development and hydrocarbon filling. In the Middle–Lower Ordovician carbonate strata, linear shear structures without deformation segments, pull-apart structure segments and push-up structure segments alternately developed along the SB1 fault. Pull-apart structure segments are the most favourable areas for oil and gas accumulation. The tight fault core in the centre of the strike-slip fault zone is typically a low-permeability barrier, whilst the damage zones on both sides of the fault core are migration pathways and accumulation traps for hydrocarbons, leading to heterogeneity in the reservoirs controlled by the SB1 fault. This study provides a reference for hydrocarbon exploration and development of similar deep-marine carbonate reservoirs controlled by strike-slip faults in the Tarim Basin and similar ancient hydrocarbon-rich basins.

中文翻译：

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塔里木盆地顺沱低隆北部SB1走滑断裂带含油气特征

塔里木盆地顺沱低隆北部发育的SB1走滑断裂带在奥陶系深部碳酸盐岩储层形成和油气成藏中具有重要作用。本研究通过对高质量3维地震体、露头、钻采资料的分析，系统地研究了SB1断层的含油气特征。SB1断层在古生代依次发育，形成了三重演化：中加里东世（III期）、晚加里东世-早海西世和中晚海西世。多断层活动有利于油藏开发和油气充注。在中-下奥陶统碳酸盐岩地层中，无变形段的线形剪切构造，沿SB1断层交替发育拉开构造段和上推构造段。拉开构造段是油气聚集的最有利区域。走滑断裂带中央的致密断层核通常为低渗透屏障，断核两侧的破坏带是油气运移通道和聚集圈闭，导致储层非均质性受SB1 故障。该研究为塔里木盆地及类似古富油气盆地类似走滑断裂控制的深海碳酸盐岩油气藏勘探开发提供参考。走滑断裂带中央的致密断层核通常为低渗透屏障，断核两侧的破坏带是油气运移通道和聚集圈闭，导致储层非均质性受SB1 故障。该研究为塔里木盆地及类似古富油气盆地类似走滑断裂控制的深海碳酸盐岩油气藏勘探开发提供参考。走滑断裂带中央的致密断层核通常为低渗透屏障，断核两侧的破坏带是油气运移通道和聚集圈闭，导致储层非均质性受SB1 故障。该研究为塔里木盆地及类似古富油气盆地类似走滑断裂控制的深海碳酸盐岩油气藏勘探开发提供参考。