Eogene Sequence Stratigraphy and Stratigraphic and Lithologic Reservoirs Prediction in Liaohe West Depression

Key words: 
• sequence stratigraphy /
• syndepositional structural slopebreak /
• stratigraphic and lithologic reservoirs /
• Eogene /
• Liaohe West Depression

Abstract: Based on tectonicsequence analysis method and using 3D seismic data, log curves, and cores, Eogene sequence stratigraphy and stratigraphic and lithologic reservoirs prediction are studied in this paper on Liaohe West Depression. One super sequence set, four super sequences and eight sequences are identified in Liaohe West Depression Eogene. Based on syndepositional structural slopebreak types, developed in Liaohe West Depression Eogene, sequences can be divided into syndepositional fault slopebreak sequence, syndepositional bent slopebreak sequence, and gently slope sequence. Syndepositional fault slopebreak sequences develop in super sequence one, two, and three. Syndepositional bent slopebreak sequences and gently slope sequences develop in super sequence four. Sand bodies, in lowstand and highstand systems tract, controlled by syndepositional structural slope break, and hydrocarbon source rocks are collocated very well, which is favorable for hydrocarbon accumulation. Meanwhile, the sand bodies, in secondary porosity zone, have very good porosity and permeability and are favorable for lithologic reservoirs bearing hydrocarbon. Based on the conclusion, the plays of favorable for lithologic reservoirs hydrocarbon bearing are put forward, which are transition zone of hanging wall block of Jin1 fault and Yuanyanggou sag, transition zone of hanging wall block of Shuangtaizi fault and Qinshui sag, and transition zone of hanging wall block of XiaowaHaiwaihe fault and Qinshui sag.