The Lithological Features of Sublacustrine Fans and Significance to Hydrocarbon Exploration: A Case Study of the Chang 7 Interval of the Yanchang Formation, Southeastern Ordos Basin, North China

Figure 5

Turbidity current deposits, and sand debris flow deposits characteristics of Chang 7 interval in the study area: (a) Bouma sequences, Hongshiya profile, Huanglong county; (b) Bouma sequences, Shiwang river profile, Yichuan county; (c) Bouma sequences, Shanshui river profile, Xunyi county; (d) Bouma sequences, Yaoqu profile, Yao county; (e) flute groove casts, Yaoqu profile, Yao county; (f) groove casts, Yaoqu profile, Yao county; (g) flute cast, well Z24, Chang 72; (h) flame structure, well H25, Chang71; (i) flame structure, well H25, Chang71; (j) irregular mudclasts, well X41, Chang 72; (k) floating mudclasts, Yaoqu profile, Yao county; (l) floating mudclasts, well ZT4, Chang7; (m) floating mudclasts and argillaceous parcel, well X99, Chang71; (n) sharp irregular contacts, well M9, Chang7; (o) sharp irregular contacts, well Y67, Chang7.

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