南哈萨克区块下石炭统层序岩相古地理及其对有利储层的控制
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摘要
利用地震、测井、岩心等资料,研究楚—萨雷苏盆地南哈萨克区块下石炭统的层序地层、沉积相、沉积演化及其对有利储层的控制.结果表明:下石炭统自下而上可划分为4个三级层序,每个层序主要由海侵和高位体系域构成.识别主要沉积相类型包括蒸发台地、开阔台地生物礁、礁—滩复合体、滩间海、局限台地澙湖、淹没台地或深水台地等,高位体系域以开阔台地相为主;海侵体系域以发育局限台地相为主,中部的SQ3发育深水—淹没台地相,上部SQ4的顶部发育蒸发台地相.总体上,由南向北可划分潮缘带—局限台地、开阔台地高能滩、台地边缘礁、滩、浅海—半深海等沉积相带.沉积、层序对储层具有明显的控制作用,台地边缘高能相带为有利的储层相带,三级或四级层序界面附近,储层质量最好,储层孔隙度大于10%.
Based on seismic data,logging and core samples,the sequence stratigraphy,sediment,sediment evolution,and their controls on reservoir distribution of lower Carboniferous are studied in southern Kazakhstan.The results show that lower Carboniferous can be divided into four three-order sequences.Every sequence is composed of trangressive system tract and highstand system tract,but lacks in the lowsand system tract.Major sedimentary facies include evaporative carbonate platform,reef-shoal complex in the open platform,reef and shoal in the platform margin,intershoal lows,lagoon in the restricted platform,and drowned rimmed carbonate platform.In the highstand system tracts,open platform facies is dominant,while restricted platform facies is dominant in the trangressive tracts.Drowned rimmed platform develops in SQ3,and evaporative carbonate platform mainly develops in upper SQ4.Facies are wholly distributed in the form of close north-south each other.From south to north,there are tidal margin zone-restricted platform,sandy shoal in open platform,reef-shoal in the platform margin,and shallow sea-bathyal sea.The distribution of the reservoirs is controlled by the sedimentary facies and sequence.Favorable reservoirs mainly distribute in the high energy facies of the platform margin and higher quality reservoirs often distribute near the interfaces of three-order sequence and four-order sequence,and their porosity are greater than 10%.
引文
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