The Yanmuxi Oilfield Study Of Sedimentary Micro-facies And Reservoir In Cretaceous

In the Yanmuxi oilfield of cretaceous, the low resistivity reservoir is influent by sedimentary facies, fracture, structure and lithology, plus the upper gypsum stratum effects by the salty mud, logging information is difficult to use. Aim at this characteristic, in this paper we picked up single penetrability sand body thickness to by various logging methods to make the borehole log shape and data able to reflect the relatively high permeability largest sedimentary energy and its thickness difference. So it overcome the lapse that the total sand thickness of several genetic similar thin sand layer ro sand-clay layer to classify frame sedimentary sand distribution.We use the dip logger to determine the direction of flow, sand body extension, stratification structure and sedimentary characteristics. Combine the research of single well sedimentary system, bisect sedimentary and ichnography sedimentary, the depositional model is built. So underwater channel sand, shallow channel sand body in front of fan delta which is the favorable sedimentary micro-faces distribution.Through the statistic of diameter, natural gamma ray, density, neutrons, acoustic as well as lithologic and porosity features. The limiting of single penetrability sand thickness is built. In the aim layer we pick up sing penetrability sand sedimentary energy, so the relationship between the favorable faces and association of source-reservoir-cap rock where oil or gas is gathering. By that method we find out that, the K1S1 phase is controlled by shallow water faces, and underwater braid channel control the K1S2 phase. And effective thickness of pay both append and present distribution is made out. So our job give reliable basis to the reserve increasing and potential capacity seeking.