The Characteristics Of Structural Combination And Its Control Of Oil And Gas In Complex Fault Blocks

Study area located in the middle of central uplift of Dongying Sag,which is a complex block.Fault and transitional structure zone were studied based on the theories of analytical tectonics, sedimentology and petroleum geology as guidance, combining previous research achievements, using drilling, logging, seismic data and geological data, and discuss the effect of oil and gas by structural styles and transitional structure zone.Study area consists of three tectonic units which are located in Xinzhen structural zone, Transitional zone, Dongying structural zone, and more complex from east to west.Study area consists of three types which contains single type, Transitional type and complex.The main plane structural styles in the east which have parallel combination faults; The main plane structural styles in middle contains parallel combination faults and skew-type combination faults; The main plane structural styles in the west which have parallel combination faults and skew-type combination faults supperposition of different periods of fault.The main profile structural styles in the study area which have y-shape, stepladder combination faults, graben, horst, graben-horst.The strips fault contains opposing tilted fault block, forward tilted detachment block, opposing tilted detachment block.Study area recognized Ying 13 transitional structure zone in the Dongying structural zone which are three-level and conjugate overlapping type transitional structure zone previous based on previous research achievements, and analysis its tectonic evolution characteristics.According to plane and longitudinal characteristics of oil and gas, discussed the effect of oil and gas by structural styles and transitional structure zone.