东营凹陷史115浊积扇油藏储层非均质性的时空演变规律及主要控制要素研究

以东营凹陷中央隆起带西段史115深水浊积扇岩性油藏为例,对储层非均质性的时空演变规律及主要控制要素进行研究,认为构造运动、湖平面变化、沉积物供给和古地貌等要素控制了扇体的发育,从而导致储层非均质性在不同时间和空间里表现出明显的差异.浊积扇发育早期,构造运动和古地貌造成扇体规模较小,储层非均质性最强.浊积扇发育中期,构造运动减弱和填平补齐作用导致扇体分布范围增大,储层非均质性较强.浊积扇发育晚期,随着构造运动进一步减弱、湖平面下降,扇体平面分布范围更加广泛,储层非均质性最弱.

Time-space evolution law and controlling factors of the heterogeneity of Shi-115 turbidite fan reservoir in Dongying Sag

The study on the characterization of reservoir heterogeneity should be from static state to dynamic state.Taking the Shi-115 block located in the west of central uplift belt of Dongying Sag as an example,the space-time evolution law and controlling factors of the heterogeneity of the deepwater turbidite fan reservoir are studied.It is held that,tectonic movement,lake-level fluctuation,the supply rate of sediments and palaeogeomorphology control the development of the turbidite fan,and therefore there is significant difference in the reservoir heterogeneity in different space and time.In the early stage of the fan development,tectonic movement and palaeogeomorphology result in the small distribution range of the turbidite fan,and the heterogeneity of the reservoir is the severest.In the middle stage,the distribution range of the turbidite fan expands due to the weakening of the tectonic movement and the backfill of sediment,and therefore the heterogeneity of the reservoir becomes slightly weaker.In the late stage,with the further weakening of the tectonic movement and the descending of lake-level,the distribution range of the turbidite fan further expands,and the heterogeneity of the reservoir is the weakest.