鄂尔多斯盆地富县地区延长组长6段—长2段沉积体系研究
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摘要
富县探区位于鄂尔多斯盆地东南部,范围主要是鄂南中石化探区的富县区块及其周缘地区。延长组长6—长2油层组为本次论文的研究对象。通过对研究区沉积学特征及各种沉积相标志的细致研究,确定了研究区内沉积相、沉积亚相类型、发育状况、平面展布特征,运用硼元素分析法分析了目的层段的古盐度,恢复了古地理特征及其平面演化,编制了不同时期岩相古地理图。
本次研究从岩石学特征入手,通过对区内野外露头、钻井岩心、测井相等资料的综合分析,结合多种相标志,认为研究区延长组长6—长2油层组沉积相类型为湖泊三角洲相、湖泊相和湖泊浊积扇相。分析了各沉积相的发育特征。三角洲沉积体系以发育三角洲前缘亚相为优势,并分布于各层位;而三角洲平原亚相仅发育于长4+5—长2时期,且分布范围局限。浊积岩发育于研究区西南部长6时期的半深湖-深湖,为低密度流湖相浊积岩,是来自盆地南部深水陡坡型辫状河三角洲前缘末端跨塌成因。
研究了富县地区延长组的古地理特征及其演化,编制了不同时期的岩相古地理图。认为长6-长2时期湖泊三角洲沉积样式为进积型三角洲,沉积序列自下而上构成一个大的反旋回。长6时期研究区仅发育三角洲前缘亚相沉积,长4+5时期研究区内发育大面积的三角洲沉积,湖岸线退至南部中富30井-中富32井一带,长3期进积作用明显,研究区全部演化为三角洲相沉积,湖岸线位于富32井-富11井-中富21井一线,到长2期三角洲继续向南推进,湖岸线位于牛西5井-富古6井一带,其南为三角洲前缘亚相沉积。
The research on Sedimentary system of chang6—chang2, upper Triassic, Fuxian area, Ordos basin
Fuxian area is located in the southeast of Ordos basin, including the Fuxian area of SINOPEC and its circum areas. Chang6—Chang2 of Yanchang formation is the object of this paper. Based on the study of sedimentary characteristic and all kinds of symbols in facies, determined the types of facies and microfacies, the development condition of the facies and its spread in plane surface. Then according to the analyzing of boron element, restoring the paleosalinity, characteristic of paleogeography and the evolvement in plane surface of the paleogeography. Drawing the lithofacies paleogeographic map in different periods.
According to the comprehensive analysis of the outcrops, cores, facies in well logging, combined to all kinds of symbols in facies, the types of facies in Chang6—Chang2 is lake delta facies, lake facies and turbidites facies in lakes. The development characteristic of these facies are Analyzed. The sedimentary system of delta is dominated by delta front microfacies and it contains in every formation. The microfacies of delta plain can be found only in the Chang4+5—Chang 2 periods and the extent of this microfacies is limited. Turbidite facies is located in the southwest of the studying area in Chang 6 period. In Chang 6 period, the southwest of the studying area is deep lake environment. The turbidite in low density comes from the end collapse of braided river delta front with steep slope.
The paleogeography characteristic and its evolution in the studying area are studied. The lithofacies paleogeographic maps in different periods are drawed. It is concluded that the sedimentary pattern of lake delta in Chang6—Chang2 periods is aggradation delta. The sedimentary sequence is a big inverse cycle from the bottom to the top. In Chang6 stage, the microfacies in the Fuxian area is delta front. Sedimentary facies of delta is development in large areas in Chang4+5 periods, and the lake strandline is located in the well line of Zhongfu 30 and Zhongfu 32. Progradation is obvious in Chang3 period and the sedimentary facies in the full studying area is delta. The lake strandline is located in the well line of Fu 32, Fu11 and Zhongfu 21 in that period. In Chang2 period the delta moved to the south continuly, and the lake strandline is located in the well line of Niuxi 5 and Fugu6. South to this line, the sedimentary microfacies is delta front.
本次研究从岩石学特征入手,通过对区内野外露头、钻井岩心、测井相等资料的综合分析,结合多种相标志,认为研究区延长组长6—长2油层组沉积相类型为湖泊三角洲相、湖泊相和湖泊浊积扇相。分析了各沉积相的发育特征。三角洲沉积体系以发育三角洲前缘亚相为优势,并分布于各层位;而三角洲平原亚相仅发育于长4+5—长2时期,且分布范围局限。浊积岩发育于研究区西南部长6时期的半深湖-深湖,为低密度流湖相浊积岩,是来自盆地南部深水陡坡型辫状河三角洲前缘末端跨塌成因。
研究了富县地区延长组的古地理特征及其演化,编制了不同时期的岩相古地理图。认为长6-长2时期湖泊三角洲沉积样式为进积型三角洲,沉积序列自下而上构成一个大的反旋回。长6时期研究区仅发育三角洲前缘亚相沉积,长4+5时期研究区内发育大面积的三角洲沉积,湖岸线退至南部中富30井-中富32井一带,长3期进积作用明显,研究区全部演化为三角洲相沉积,湖岸线位于富32井-富11井-中富21井一线,到长2期三角洲继续向南推进,湖岸线位于牛西5井-富古6井一带,其南为三角洲前缘亚相沉积。
The research on Sedimentary system of chang6—chang2, upper Triassic, Fuxian area, Ordos basin
Fuxian area is located in the southeast of Ordos basin, including the Fuxian area of SINOPEC and its circum areas. Chang6—Chang2 of Yanchang formation is the object of this paper. Based on the study of sedimentary characteristic and all kinds of symbols in facies, determined the types of facies and microfacies, the development condition of the facies and its spread in plane surface. Then according to the analyzing of boron element, restoring the paleosalinity, characteristic of paleogeography and the evolvement in plane surface of the paleogeography. Drawing the lithofacies paleogeographic map in different periods.
According to the comprehensive analysis of the outcrops, cores, facies in well logging, combined to all kinds of symbols in facies, the types of facies in Chang6—Chang2 is lake delta facies, lake facies and turbidites facies in lakes. The development characteristic of these facies are Analyzed. The sedimentary system of delta is dominated by delta front microfacies and it contains in every formation. The microfacies of delta plain can be found only in the Chang4+5—Chang 2 periods and the extent of this microfacies is limited. Turbidite facies is located in the southwest of the studying area in Chang 6 period. In Chang 6 period, the southwest of the studying area is deep lake environment. The turbidite in low density comes from the end collapse of braided river delta front with steep slope.
The paleogeography characteristic and its evolution in the studying area are studied. The lithofacies paleogeographic maps in different periods are drawed. It is concluded that the sedimentary pattern of lake delta in Chang6—Chang2 periods is aggradation delta. The sedimentary sequence is a big inverse cycle from the bottom to the top. In Chang6 stage, the microfacies in the Fuxian area is delta front. Sedimentary facies of delta is development in large areas in Chang4+5 periods, and the lake strandline is located in the well line of Zhongfu 30 and Zhongfu 32. Progradation is obvious in Chang3 period and the sedimentary facies in the full studying area is delta. The lake strandline is located in the well line of Fu 32, Fu11 and Zhongfu 21 in that period. In Chang2 period the delta moved to the south continuly, and the lake strandline is located in the well line of Niuxi 5 and Fugu6. South to this line, the sedimentary microfacies is delta front.
引文
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陈全红,李文厚,郭艳琴等.鄂尔多斯盆地南部延长组浊积岩体系及油气勘探意义[J].地质学报,2006.80(5)656-662
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