Study Of Turbidite Deposit Features And Reservoir Model In The Middle Part Of Es3 In The West Of Central Belt Of Dongying Sag

The major depositional system is river-delta-turbidite at the direction of major axis in central belt of Dongying sag at the middle part time of Es3. It developed a lot of kinds of turbidite in the west of central belt of Dongying sag. As we knew, it is easy to form reservoir for turbidite. Turbidite reservoir takes more and more proportion in the incremental reserves and become the major goal of exploration now.Taking turbidite of the middle part of Es3 in central belt of Dongying sag as a study object, this paper divided the middle part of Es3 into 6 isochronostratigraphic units, and studied the feature, regular and model of deposition, the response of seismic and logging, and the characteristic of bearing oil, and pointed out that turbidite has related with delta in genetic aspect, and founded respondent depositional model by using the data of seismic, drill, logging and laboratory test at the base of sequence stratigraphy and sendimentography.The paper divided turbidite fan in deep water from long source into braided channel microfacies, inter-braided channel microfacies, medium fan over-belt microfacies, and external fan subfacies, and divided slump turbidite which related with delta into medium fan subfacies and external fan subfacies, and summed up 15 kinds of marking of subfacies and microfacies classification. At the same time, it formed a series of effective technology of analyzing turbidite source at the base of studying region geological which combined with analyzing the content change of terrigenous debris, with the found of logging facies, and with the ancient terrestrial magnetism test and other technology means under the guidance of three-dimensional model of turbidite which has been founded already and the flat surface feature of microfacies.Finally, this paper analyzed reservoir characteristic of turbidite lithologic reservoir and the control iactors of oil and gas enrichment and high production and figure out that the major factors of influence and control reservoir are pressure, temperature, microfacies types, sand thickness, the action of fault, and the non-uniform feature of reserve by anatomizing typical reservoir.