Research On The Sedimentary Microfacies Of First Oil Group Third Member Of Hetaoyuan Formation In Shuanghe Oilfield

Shuanghe oilfield is located in the southern Biyang depression, it is a secondary depression developed in the south-eastern of Nanxiang Basin which is nose structure-based. The third paragraph of Eogene Hetaoyuan Formation is the main oil-bearing layer in Shuanghe oilfield. Shuanghe oilfield have gone into the mid and late development. To meet the needs of Shuanghe oilfield development program design, we have a further study about the basic geological to the field.Through detailed description and observation of the core, applying to the principle "cycles contrast, grading control", this paper carries out the division and correlation of the substratums and deposition time units, and we can divides 1st oil group He-3 member into five substratum and 15 deposition time units.The type, the geometrical scales and the distributions of microfacies sandbodies are the basis of studying on underground oil and water movement. The microfacies and their distributions of fan-delta front in Shuanghe oilfield are analyzed by using sealed coring data etc. The oil source is sufficient in the study region, the deposition mass is the fan delta deposit system, and mainly develops sub-facies deposition of the front fan delta. It develops thick sandstone, the glutenite and so on, buring shallowly, and the property is better. Seven microfacies including distributary channel, mouth bar, front sheet sand, overflow sand, gravity flow sand, triage between bay and the front delta mud are developed in the fan-delta front. The source direction of 1st oil group mainly is the south, southeast, other including the north, northwest and northeast.The reservoir property is controlled by microfacies types and their distribution, and influences the capacity of the producing liquid and the water absorption of the oil wells, and control the underground water movement. Therefore, using the research results of sedimentary microfacies, it can play better results in pinpointing the remaining oil-rich region and enhancing oil recovery.