浅议塔河地区“东河砂岩”三角洲沉积
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摘要
近年来在塔河地区钻揭了一套典型的河控三角洲相"东河砂岩",它与东河塘、塔中和哈得逊等地区发现的前滨相和滨面相"东河砂岩"明显不同。钻井岩心上该套三角洲相砂岩表现为板状交错层理、平行层理厚砂体;粒度概率具有河道、河口坝微相特征;平面上地震振幅、反射强度斜率属性异常呈以S99、T728井为中心的"鸟足状"外形;古盐度测试结果反映在三角洲河口附近的S109、T727井为半咸水沉积。综合钻井、测井、地震、地球化学等资料的分析,塔河地区"东河砂岩"除发育滨海沉积外,同时还发育三角洲前缘分流河道、河口坝沉积,该区"东河砂岩"为河控型朵状三角洲—滨海沉积体系。
In recent years typical river controlled delta sediments have been discovered by drilling in Tahe area.They obviously differ from Donghe sandstone found in Donghetang area,Tazhong area and Hade area,which are offshore and shore facies deposition.This formation has thick sandbody with tabular cross-bedding and parallel bedding.The grain size probability curves show the features of tributary channel and mouth bar sediments.Both the RMS amplitude map and the reflection strength slope map of the top of Donghe sandstone formation display bird foot shape abnormal attribute area whose center involves well S99,well T728.The paleosalinity data indicate that the paleosalinity of well S109 and well T727 near paleo delta estuary is semi-saline.The synthetic analyses of drilling cores,log curve,seismic data and geochemistry data suggest that Donghe sandstone in Tahe area has tributary channel and mouth bar sediments besides the littoral sediments.Hence,Donghe sandstone is a river controlled and littoral deposit.
In recent years typical river controlled delta sediments have been discovered by drilling in Tahe area.They obviously differ from Donghe sandstone found in Donghetang area,Tazhong area and Hade area,which are offshore and shore facies deposition.This formation has thick sandbody with tabular cross-bedding and parallel bedding.The grain size probability curves show the features of tributary channel and mouth bar sediments.Both the RMS amplitude map and the reflection strength slope map of the top of Donghe sandstone formation display bird foot shape abnormal attribute area whose center involves well S99,well T728.The paleosalinity data indicate that the paleosalinity of well S109 and well T727 near paleo delta estuary is semi-saline.The synthetic analyses of drilling cores,log curve,seismic data and geochemistry data suggest that Donghe sandstone in Tahe area has tributary channel and mouth bar sediments besides the littoral sediments.Hence,Donghe sandstone is a river controlled and littoral deposit.
引文
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[21]Couch E L.Calculation of paleosalinites from boron andclaymineral data[J].AAPG Bulletin,1971,55(10):1829-1839.
[2]王招明,田军,申银民,等.塔里木盆地晚泥盆世—早石炭世“东河砂岩”沉积相[J].古地理学报,2004,6(3):289-296.
[3]郭建华,朱美衡,刘辰生,等.阿克库勒凸起“东河砂岩”的沉积相与层序地层[J].石油与天然气地质,2005,26(6):808-815.
[4]龚丹,宁松华.塔河南托浦台地区泥盆系地震相与沉积相分析[J].石油天然气学报,2006,28(6):73-76.
[5]王家豪,王华,赵忠新,等.新疆塔河油田石炭系层序地层分析及低水位岩性圈闭预测[J].地质科技情报,2004,23(1):57-62.
[6]Richard G H,Kenneth D R.Sedimentology and sequence stra-tigraphy of fan-delta and river-delta deposystems,Pennsylva-nian Minturn Formation,Colorado[J].AAPG Bulletin,2003,87(7):1169-1191.
[7]Cornel O,Ronald J S,Andrew L P.Delta-front hyperpycnalbed geometry and implications for reservoir modeling:Creta-ceous Panther Tongue delta,Book Cliffs,Utah[J].AAPGBulletin,2010,94(6):819-845.
[8]Andrew A K,Jennifer M T.Seismic stratigraphy of a largeCretaceous shelf-margin delta comples,offshore southern Aus-tralia[J].AAPG Bulletin,2003,87(6):935-963.
[9]Alaa M,Salem S M,Luiz F,et al.Diagenesis and reservoir-quality evolution of fluvial sandstones during progressive burialand uplift:Evidence from the Upper Jurassic Boipeba Mem-ber,Reconcavo Basin,Northeastern Brazil[J].AAPG Bulle-tin,2000,84(7):1015-1040.
[10]Martin K R,Baker J C,Hamilton P J,et al.Diagenesis andreservoir quality of Paleocene sandstones in the Kupe SouthField,Taranaki Basin,New Zealand[J].AAPG Bulletin,1994,78(4):624-643.
[11]孙玉善,杨帆.再论东河砂岩孔隙成因:以塔中地区为例[J].沉积学报,1999,17(12):699-705.
[12]孙玉善,申银民,徐迅,等.应用成岩相分析法评价和预测非均质性储层及其含油性:以塔里木盆地哈得逊地区为例[J].沉积学报,2002,20(1):55-60.
[13]Roar H.Definition of geohazards in exploration 3-D seismicdata using attributes and neural-network analysis[J].AAPGBulletin,2004,88(6):857-868.
[14]Susumu T,Kazuaki H,Yoshiki S,et al.Sedimentary faciesand radiocarbon dates of the Nam Dinh-1 core from the SongHong(Red River)delta,Vietnam[J].Journal of Asian EarthSciences,2003,21:503-513.
[15]冯明友,韩强,蒲仁海.用反射波强度斜率识别层序及沉积环境[J].新疆石油地质,2008,29(3):380-381.
[16]邓宏文,钱凯.沉积地球化学与环境分析[M].兰州:甘肃科学技术出版社,1993.
[17]郑荣才.鄂尔多斯盆地长6油层组古盐度研究[J].石油与天然气地质,1999,20(1):20-25.
[18]Deckker P,Chivas A R,Shelley J M G,et al.Ostracod shellchemistry:A new palaeoenvironmental indicator applied to ar-egressive/transgressive record from the Gulf of Carpentaria[J].Palaeogeogr.Palaeoclimatol.Palaeoecol.,1988,66:231-241.
[19]Walker C T,Price N B.Departure curves for computing pal-eosalinity from Boron in illites and shales[J].AAPG Bulletin,1963,47(5):833-841.
[20]Adams T D,Haynes J R,Walker C T.Boron in Holocene il-lites of the dovey estuary,wales,and its relationship to pal-eosalinity in cyclothems[J].Sedimentology,1965,4:189-195.
[21]Couch E L.Calculation of paleosalinites from boron andclaymineral data[J].AAPG Bulletin,1971,55(10):1829-1839.
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