Petroleum Resource Evaluation For Fuyu Reservoir Of Zhou4Block，Songliao Basin

The Zhou4block of Songliao Basin, which is a membership of Zhaozhouoilfield, is located in the territory of Zhaozhou County, Daqing City, HeilongjiangProvince. The regional tectonic is located in the east of Zhaozhou nose structure ofSanzhao depression of central depression district of northern Songliao Basin. Atpresent, oil and gas reserves obtained by the working area have been mainlyconcentrated in Pu-tao-hua reservoir. Fuyu reservoir, as the next succeeding layers ofoil and gas production, has important theoretical and practical significance forcomprehensive resource evaluation for Fuyu reservoir.Under the theoretical guidance of sequence stratigraphy,sedimentology and oiland gas geology, the paper makes full use of geological, geophysical and test datum,and combines accurate calibration with stratigraphic interface of Fuyu oil in the wellseismic. On the basis of establishing sequence stratigraphic framework, it focuses onstructural analysis, sedimentary evaluation, reservoir prediction and forming lawresearch and finally makes the evaluation and optimization of resources come true andbenefit developing block. The main results and achievements obtained are asfollowing:1. Established seismic sequence stratigraphic framework of well seismic,divided the Fuyu oil layer into three grade III sequence and five oil groups andsubdivided FIoil layer into three sands group.2. As the structural interpretation indicates,the working areas are mainlycontrolled by normal faults, and the near north-south trending faults are the masterfault. The hard base combination is mainly on the section. Plane show the character ofhigher in the west and lower in the east. Different directions faults were mutuallyintersected as a checkerboard format.3. Determine the Fuyu oil layers as the delta front subfacies. Provenance ismainly north-south trending. Mainly developed two kinds of micro-phase: underwaterdistributary channel and sheet sandstone. The location of each phase of the river isrelatively stable. 4. Seismic inversion techniques are used to carry out reservoir prediction.Among Fuyu oil layers, the sand bodies of FI are the most developed. Sand layerunder the group of FIis the main group. Thick layer of sand body suitable source has abanding distribution and mainly focuses on the area of Zhao404–Zhou3-Zhou5andthe area of Zhou401-Zhou1with thickness of9-12m.5. Use volume method to predict the oil geological reserves of Fuyu oil layerstotally as951.84×104t, among which the amount of exploitable reserves is180.85×104t. Give priority to choose the Zhou101well area, Zhao41-44well area,the west area of Zhou4well and the south-west of Zhou3well as the most favorablearea. Given advises to deploy two exploratory wells separately in the high point of thesouthern part of Zhou4well area and the south west part of Zhou3well area.