Evaluation Of Reservoir Of Dongying Section In The South Provenance Of Nanpu Sag

This paper research range is located in southern area where Shaleitian uplift is the main provenance of Nanpu sag,including No.1,No.2 and No.3 tectonic belt.The article study on Dongying section.The paper is deal to analyze the distribution characteristics of sand body and the physical property characteristics of reservoir.The sand body in the study area is from southwest to the North East.The main sedimentary facies is underwater distributary channel、mouth bar、sand sheet of braid river delta front and distributary channel、braided river、distributary bay of braided river delta plain.The distribution characteristics of sand body is mainly controlled by the sedimentary facies.The physical property characteristics of reservoir of this area is matched with the distribution characteristics of sand body.The physical property characteristics of reservoir are generally good in underwater distributary channel of braided river delta front and in distributary channel、braided river of braided river delta plain,while the physical property characteristics of reservoir are bad in distributary bay.The influence factors of physical property of reservoir in this area is sedimentary facies and diagenesis,in addition,provenance distance also control it.Studying on reservoir petrology characteristics,we can conclude that,in this area,the main composition of the rocks is terrigenous clastic.The area mainly comprise lithic arkose and feldspathic litharenite and include a little intraclast.The size of stone is mainly medium-grained sand and many areas contain mud gravel.The grain gradation is moderate,psephicity is mainly subangular to subrounded,and grains are point contact or point-lineal contact.Support types is grain-supported,and the cementation types are mainly pores.And the main diagenetic stage is in stage B of the early diagenetic and stage A of middle diagenetic.The diagenesis of this area is mainly containing compaction and cementation in the early time and dissolution and metasomasis in the middle time.The clay mineral cementation is mainly contain andreattite,montmorillonite,kaolinite and goeschwitzite.According to the analysis of diagenetic sequence in this area,we can conclude that dissolution and microcrack is benefit of reservoir,but the strong compaction,calcitic cementation and filling of clay minerals,cementation,siliceous metasomatism always damage reservoir.In the paper we select some parameters which have a great impact on reservoir to comprehensive evaluate reservoir by gray system theory,and we divide the reservoir into three types in the end.The Class I which is good reservoir reservoir mainly located in the first group of Dongying section of No.1 and No.3 tectonic belt,and is one of the most favorable reservoir area.The Class II which has good reservoir properties is located in the first and second group of Dongying section of No.2 tectonic belt.While,the Class III is located in in the second and third group of Dongying section of No.1 tectonic belt and in the third group of Dongying section of No.2and No.3 tectonic belt,which has poor reservoir properties.