石油与天然气地质
石油與天然氣地質
석유여천연기지질
OIL & GAS GEOLOGY
2013年
6期
751-757
,共7页
陈倩倩%丁晓琪%万友利%张哨楠
陳倩倩%丁曉琪%萬友利%張哨楠
진천천%정효기%만우리%장초남
浅湖%滩坝%沉积微相%沉积模式%阜宁组%张家垛油田%苏北盆地
淺湖%灘壩%沉積微相%沉積模式%阜寧組%張傢垛油田%囌北盆地
천호%탄패%침적미상%침적모식%부저조%장가타유전%소북분지
shallow lacustrine%beach-bar%sedimentary microfacies%sedimentary model%Funing Formation%Zhangjiaduo oil-field%Subei Basin
苏北盆地张家垛油田阜宁组三段发育4种岩相:黑色泥岩相,生物扰动粉砂岩相、泥质纹层+生物钻孔粉-细砂岩相及平行层理细砂岩相。剖面结构主要为向上变粗的反韵律,其次是向上变粗复变细的复合韵律,几乎不见正韵律。根据岩石相、剖面结构、测井相及粒度累计曲线,认为阜宁组三段为浅湖滩坝沉积。根据沉积特征和砂体展布规律,将储层进一步划分为坝砂和滩砂,并提出该地区的滩坝沉积模式。坝砂由于泥质含量低、储层物性好,油气充满度高;而滩砂泥质纹层理发育,非均质性弱。由于主要充填在平行层理细砂岩相和泥质纹层+生物钻孔粉砂岩相中,充注程度差别大。
囌北盆地張傢垛油田阜寧組三段髮育4種巖相:黑色泥巖相,生物擾動粉砂巖相、泥質紋層+生物鑽孔粉-細砂巖相及平行層理細砂巖相。剖麵結構主要為嚮上變粗的反韻律,其次是嚮上變粗複變細的複閤韻律,幾乎不見正韻律。根據巖石相、剖麵結構、測井相及粒度纍計麯線,認為阜寧組三段為淺湖灘壩沉積。根據沉積特徵和砂體展佈規律,將儲層進一步劃分為壩砂和灘砂,併提齣該地區的灘壩沉積模式。壩砂由于泥質含量低、儲層物性好,油氣充滿度高;而灘砂泥質紋層理髮育,非均質性弱。由于主要充填在平行層理細砂巖相和泥質紋層+生物鑽孔粉砂巖相中,充註程度差彆大。
소북분지장가타유전부저조삼단발육4충암상:흑색니암상,생물우동분사암상、니질문층+생물찬공분-세사암상급평행층리세사암상。부면결구주요위향상변조적반운률,기차시향상변조복변세적복합운률,궤호불견정운률。근거암석상、부면결구、측정상급립도루계곡선,인위부저조삼단위천호탄패침적。근거침적특정화사체전포규률,장저층진일보화분위패사화탄사,병제출해지구적탄패침적모식。패사유우니질함량저、저층물성호,유기충만도고;이탄사니질문층리발육,비균질성약。유우주요충전재평행층리세사암상화니질문층+생물찬공분사암상중,충주정도차별대。
Four types of lithofacies are identified in the 3rd member of Funing Formation in Zhangjiaduo oilfield ,the Su-bei Basin,including dark mudstone,bioturbated siltstone,siltstone-fine sandstone lithofacies with argillaceous laminates and burrow as well as fine sandstone with parallel bedding .Upward-coarsening reverse rhythm is the main section struc-ture,followed by first upward-coarsening and then upward-thinning composite rhythm ,while positive rhythm is very rare . All the features of lithofacies ,section structure ,logging facies and cumulative grading curve show that the 3rd member of Funing Fm is typical shallow lake beach-bar facies.According to the sedimentary characteristics and spatial distributions , the reservoirs are further divided into sandstone of bar microfacies and sandstone of beach microfacies .A beach-bar sedi-mentary model is proposed .The sandstone reservoirs of bar microfacies are high in hydrocarbon fullness , due to its low shale content and high porosity .In contrast ,the sandstone reservoirs of beach microfacies show great variance in hydrocar-bon fullness as argillaceous laminations are well developed ,heterogeneity is week ,and hydrocarbons mainly fill in the fine sandstone lithofacies with parallel bedding and argillaceous laminates +burrow fine sandstone lithofacies .