Research On Sedimentary Characteristics Of Delta Facies And Reservoir Architecture Of 7-8th Sands Groups Of Es2 In Sheng 2 Block Of Shengtuo Oilfield

Based on the data of core,logging,modern sediments,outcrop and production performance,the integrated study on the sedimentary characteristics and sand body architecture of the 7-8th sands groups of Es2 in Sheng 2 block of Shengtuo Oilfield were carried out,and the distribution of reservoir quality and dynamic variation of reservoir parameter in architecture unit during producing were analyzed.The results are as follows:The type of sedimentary facies is reaffirmed.The 8th sands group is banded Gilbert-type lake delta deposit formed in the background of forced lake regression controlled by episodic tectonic subsidence.The 7th sands group is low water vibration lake delta deposit formed in the background of lake level fluctuation delta-plain facies in coexistence with delta-front facies.The single-genesis sand body boundary is identified and divided according to the reservoir architecture stepwise analysis of delta facies under tight well pattern condition.The distribution pattern of interlayer in single distributary channel and single mouth bar in Sheng 2 Block is established and the quantitative identification standard for interlayer is sum up.Based on the change characteristics of macro and micro reservoir parameter in different architecture unit during water injection,the 3D mouth bar model of 832 sand is reconstructed in selected well block with small well space,more coring well and with abundance of production performance data.