| The North China rift during the Proterozoic and the rift with developmentalgroove featuring Yanliao rift trough began cracking1.8Ga ago, The Wumishandeposition of (Mesoproterozoic interim) Aulacogen final form. Tianjin Jixian strongdepression in the center of North China, the total sediment thickness in the region of10000m, except in North China and South China Department of Sinian in the easternedge of the platform, and the western edge of the southern edge of missingstratigraphic range. Tianjin Jixian strata is the standard cross-sectional area in NorthNeoproterozoic stratigraphic division and correlation. North China Wumishansediment thickness1030-5400m range, located in Tianjin, North China regionYanliao Aulacogen strong depression in the heart, sediment thickness over3300m.Huabei Oilfield will Wumishan divided into12segments, measured then select thenext, in a typical section of the profile include (1) Wang Chuang Wumishan twosegments,(2) Zhao Jiayu Wumishan paragraph6,(3) fox valley fog Hill fan group.8,(4) Komine child Wumishan11segments.Based on the typical interval of geological surveys, measurement andcross-section analysis of indoor identified in Wumishan Jixian Tianjin North China,defined microbial dolomite Wumishan major rock types. Microbial dolomite in thestudy area is divided into two types, twelve sub-categories. Include:(1) the laminarmicrobial dolomite: layered stromatolite/clot quality layered stromatolite/Layeredthrombolite dolomite, dolomite and a small cylindrical layers proluta thrombolitedolomite,(2) non-laminar microbial dolomite: clot stone dolomite, dolomite and clotoncoids/sand debris microbial cladding dolomite. Summarizes the various types ofmicroorganisms dolomite identification. Wumishan clear tidal sedimentary rocks andmicrobes with signs that the intertidal zone to a level of output is characterized bysiliceous nodules, intertidal to intermittent like laminae, siliceous laminae, wavy laminated and hummocky lamination is characterized by the Ministry to bringsubtidal clots oncoids, or a combination of successive laminae associated microbialrock formation is characterized by low energy subtidal zone and clastic sedimentarygrains caused clouds to orogeny rock is characterized.Combined with microbial dolomite sedimentology, comprehensive study ofreservoir porosity and permeability testing petrology and analysis, initially identifiedconstitute microbial dolomite reservoir rock types are:(1) the quality of the layeredstromatolite clot/layered stack clot layer of stone/messy like thrombolite dolomite,(2) cone/cone column thrombolite dolomite,(3) a small cylindrical clot (includingclot aggregates) stromatolite dolomite (4) palmate/plexiform clot (including clotaggregates) stromatolite dolomite,(5) clot/sand debris microbial cladding dolomite.Through macro and micro characteristics of microbial growth and physical propertiesof the rock pores statistical analysis, Clearly the main reservoir of microorganismsspace rock types:(1) intergranular corrosion holes,(2) along the grain boundary layerdevelopment of corrosion holes sewn,(3) the grain dissolution holes. Especiallyintergranular corrosion holes microbial laminae clot associated with the mostdeveloped, as well oil and gas reservoir space. The degree of development of its mainreservoir space rocks by microbes original structure, compared with late controlerosion and filling. Preliminary determination of microbial Wumishan rock reservoirspore complex seam reservoirs. Microbial reservoir rocks can be classified as follows:ClassⅠgood reservoir rock: layered thrombolite/clot quality layered stromatolitedolomite, dolomite tapered cylindrical thrombolite; class Ⅱ poor reservoir rock:palmate/plexiform thrombolite dolomite, dolomite small columnar thrombolite, clot/sand debris microbial cladding dolomite; class Ⅲ non-reservoir rock: rock dolomiteclot, cone thrombolite dolomite.By microbial dolomite reservoir facies rock types and structures combining clearWumishan can form an effective reservoir rocks the size of microbial growth in thesubtidal lagoon-tidal energy band (microbial reef), and describes Spread the form ofmacro-microbial effective reservoir rock collective. Anatomy of a preliminarygeological characteristics of oil and gas in North China Wumishan Renqiu buried hilltype of oil and gas fields. Using effective macro reservoir distribution, hydrocarbonsource rocks and ancient hill developmental conditions characterized by combining apreliminary forecast Ji Zhong and Yan Liao depression scale of the cone columnardevelopment thrombolite dolomite buried hill structure (depression in the bedrock ridges) in North China Wumishan buried hill type of oil and gas potential of favorableoil and gas exploration areas. |
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