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利用高精度3D地震、测井和录井资料,建立了大民屯凹陷沙三段、沙四段高精度层序地层格架。沙三段、沙四段层序体系域构成特征属于受同沉积断裂坡折控制的层序,低位体系域主要发育低位三角洲,并分布在同沉积断裂坡折之下;高位体系域主要发育大型河流或扇三角洲沉积体系,并发育四级层序;湖扩展体系域在坡折带之下发育深湖泥岩和油页岩,在坡折之上发育滨浅湖沉积。SSq3-1层序(沙三中下亚段)和SSq2-1层序(沙四段)发育的受同沉积断裂坡折控制的低位域砂体分布在湖扩展域优质烃源岩之下。这些砂体正好处于沙三段、沙四段超压带内,对形成岩性油气藏十分有利。斜坡区SSq2-1层序、荣胜堡洼陷SSq2-1和SSq3-1层序发育的受同沉积断裂控制的低位域砂体最有利于形成岩性油气藏。
Using high-precision 3D seismic, well logging and well logging data, a high-precision sequence stratigraphic framework of the Sha 3 Member and Sha 4 Member in the Damintun Depression has been established. The composition of the sequence stratigraphy of the Es3 and Es4 belonged to the sequence controlled by the syndepositional fault slope. The lower system tract mainly developed in the lower delta and was distributed below the synsedimentary fault slope. The upper system tract mainly developed large-scale River or fan delta sedimentary system, and the development of the fourth-order sequence. The lake extension system tract developed deep lake mudstone and oil shale beneath the slope break zone, and the shallow-shallow lake sediments developed above the slope fold. Lowerstand sandbodies controlled by synsedimentary fracture slope in the SSq3-1 sequence (middle and lower sand-sand segment) and SSq2-1 sequence (sand-fourth segment) are distributed under high-quality source rocks in the lake extension area. These sand bodies are located in the overpressure zone of Es3 and Es4, which is very favorable to the formation of lithologic reservoirs. The SSq2-1 sequence in the slope area, the SS7-1 and SSq3-1 sequences in the Rongshengpu sag, are most favorable for the formation of lithologic reservoirs, which are controlled by synsedimentary faults.