13. Hydrocarbon Traps 21 TRIASSIC RED BEDS waste zone within reservoi nd skeletal boundary zones from North, 1985) Transition zone Depositional or diagenetic E Hydrocarbon accumulation Migration pathway Figure 13. 2. Common trap limitations. (A)Waste or nonproductive zones in trap. (B)Multiple impermeable layers in creating several individual oil-water contacts. (C)Non- to poorly productive transition zone(from reservoir to seal above productive reservoir. (D)Lateral transition from reservoir to seal.(E Lateral, stratigraphically controlled leak (F)Lateral leak point or thief bed13. Hydrocarbon Traps 221 B TRIASSIC RED BEDS ^* f **& ^ (from North, 1985) zone of anhydrite impregnation multi-level oil/water boundary zones V^V^KSP^^D : "How permeability chalky limestone seat-seals Hi algal and skeletal reservoirs <^^/&&^g&i0iqg^&jjieHt*^l^i**i*&*if*&i Depositions^ or diagenetic transition between reservoir and seal Hydrocarbon accumulation Migration pathway Figure 13.2. Common trap limitations. (A) Waste or nonproductive zones in trap. (B) Multiple impermeable layers in trap creating several individual oil-water contacts. (C) Non- to poorly productive transition zone (from reservoir to seal) rock above productive reservoir. (D) Lateral transition from reservoir to seal. (E) Lateral, stratigraphically controlled leak point. (F) Lateral leak point or thief bed