The Relationship Between Faults And Hydrocarbon Migration And Accumulation In Dongxin Area Of Central Uplift Belt In Dongying Depression

Comprehensive application of petroleum geology, structural geology, geophysics andother disciplines, theories and methods, the relationship of the fault with the petroleumaccumulation of central uplift belt in Dongying sag was studied.Combining with regional geological background, the characteristics of the developmentof the fracture and the distribution of the petroleum was summarized, and the types offault-transformed zone were divided, clearing the accumulation characteristic of the oil andgas. The fault-transformed zone can be divided into four types: controlled by single fault,parallel, approach and overlay type. The petroleum was mainly enriched in the structural highpart of the Fault Block cut by the main fault for the type of controlled by the single fault. Thepetroleum was banding distribution in the type of parallel The petroleum was mainly enrichedin the structural high part of the arc fault block for the type of approach, for the type of theoverlay, the petroleum was mainly exist in the waist of the fault-transformed zone.The difference of the fault activity and its effect to the distribution of the petroleum hasbeen analyzed. Fault’s typical assemble pattern of the section is the type of cabbage, faultactivity is stronger in the two wings, and it’s the main source fault, fault activity is weaker inthe core par. The distribution of the area was controlled by Source fault, and the hydrocarbonenrichment was controlled by the fault activity.According to the occurrence of the fault surface and fault open-close coefficient, faultsealing has been studied. Gentle slopes of the fault surface ware beneficial to theaccumulation of the hydrocarbon. SGR method, diferent displacement pressure between faultand reservoir,opening and closing coefficient are three different methods to evaluate theheight of the oil column quantitatively. Forming mechanism and petroleum geological significance of fault asphalt have beenanalyzed. Asphalt mainly exist in the interior structure of fault zone where the fracturemorphology changing from steep to gentle of the deep fault. The main developing d Segmentis7-15sand group of Es2. For the sealing property of the interior structure of fault zonewhere fracture morphology changing from steep to gentle is well, oil accumulated in it,because of the biodegradation and oxidization, the oil viscosity of oil increased, fault asphaltformed in the stage of erosion period. The oil column height is tallest closed by the faultasphalt.By comprehensive analysis, the fault of the two wings conduct closed by fault andasphalt accumulated in the fault-transformed zone accumulation mode has been established;fault-transformed zone, fault activity and fault asphalt play an important role in theaccumulation of petroleum.