The Research Of Reservoir Characteristics And Sedimentary Facies Of Wangguantun

The wangguantun oilfield located at kongnan area of huanghua depression,both sides of the kongdong fault .The anticline structure is controlled and complexed by the kongdong fault,structural area is about139 km 2. It is a dominate hydrocarbon zone in this area. But the evaluation,exploration and development to wangguantun oilfield were restricted because of the complicated geological conditions include fault distribution, complicated sandstone distribution and the complicated oil-water distribution. This paper was about the prediction,evaluation and comprehensive study on sedimentary facies and reservoir characteristics of wangguantun oilfield under the guidance of the high-resolution sequence stratigraphy,reservoir sedimentology,reservoir geology and on the basis of logging data,logging and core data for the kongdian group Ek1which have guiding role for the further development later.Kongnan area developed Kongdian Group (Ek) Shahejie Group(Es) and Dongying Group(Ed) in Paleogene Eocene and Guantao Group in Mirocene from bottom to top. ZaoⅡ/Ⅲ/Ⅴis the important horizon of study.Five kinds of sedimentary facies can been recognized in the Ek1 ,The deep reservoirs mainly developed compaction,cementation,metasomasis and dissolution.The reservoir spaces include intergranular dissolved pore,intragranular dissolve pore , mold pore,especially big pore and micro crack.The intergranular dissolved pores are the main reservoir space.Middle pore and low permeanbility is the main components of reservoirs.Reservoir mainly to severe heterogeneous in study area.Kongdian group EK1 can be divided into two third-order sequences,ten fourth-order sequences,six system sracts and twenty half-cycles of mid-term datum plane.SequenceⅠequivalent to ZaoⅣ/Ⅴ. SequenceⅡequivalent to Zao 0/Ⅰ/Ⅱ/Ⅲ. The division scheme has universal applicability in the study area.。In the SequenceⅠZaoⅤterm,it filled the study area with semi-arid delta mainly with shallow lake.Sheet sands is the highquality reservoir body in the delta front during this period .At the uplifted side of kongdong fault the existence of primary porosity marked the quality of reservoir. As kongdong fault movement,the north is higher than south,In the ZaoⅡⅢperiod ,sedimentary facied is transition to fan delta front and braid delta depositional model for the main.Subaqueous distributary channel sand which existed primary pore is the best on the kongdong uplifted side this period, followed by sheet sand.Integrated reservoir physical property , heterogeneity , microscopic pore structure, among the sand bodies which under the control of the isochronous stratigraphic framework in the study area,we take the sand bodies of ZaoⅢC2 cycle and ZaoⅣC1 cycle as the high quality reservoirds...