Early Paleozoic Extension-Compression Transition and Formation of a Paleo-Oil Reservoir System in the NW Sichuan Basin: Implications for Deeply Buried Hydrocarbon Accumulation

Figure 4

Paleo-oil reservoir distribution of the Tianjingshan Paleouplift area. (a) Bitumen under the Ediacaran-Cambrian unconformity, located at Dengying Fm, Hujiaba, Ningqiang. (b) CJG-10 is the oil seeps from micrite Feixianguan Fm, located at Changjianggou and Shangsi. (c) GY-7 is the oil seep in stylolite and fractured limestone, located at Changjianggou, Shangsi. (d) TB-8 is the siltstone with large bitumen dyke intrusion, located at Changjianggou Fm, the Nianziba structure. (e) CJG-12 is dry oil seep in dolomite, which is located at Devonian-Permian, Jianfeng. (f) NZB-04 is oil seep in siltstone, which is located at Changjianggou Fm, Jianfeng. (g) TJS-01 is oil seep in siltstone, which is located at Pingyipu Fm and Tianjingshan. (h) QLK-01 is tar sand and oil sand, which is located at Shaximiao Fm, Huangjinkou. (i) HB-01 is the oil pool of the Xinjiagou-1 well, which is located at Shaximiao Fm, Qinglinkou.

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