辽东湾南部东营组二段强制湖退沉积体的发现及其地质意义
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摘要
辽东湾南部东营组二段下部发育一套斜交前积结构地层,通过单井精细沉积作用分析和三维地震资料综合解释与分析,认为该套沉积是一套强制湖退沉积体,主要由于东营组二段沉积时期湖平面强烈下降形成。强制湖退沉积体在区域上可以识别出6期三角洲前积体依次前积叠覆,并发育一系列下切谷,在三角洲前缘部位还发育滑塌沉积,但三角洲顶积层不发育,这些特征与国内外典型强制海退沉积体的表现特征非常相似。采用正演模拟方法对强制湖退沉积作用形成机制进行了分析。辽东湾南部东营组二段强制湖退沉积体的发现,有助于该地区东营组一段及东营组二段区域地层解释与对比,对于开拓该地区油气勘探思路和推动岩性地层油气藏勘探具有一定的战略意义。
In the lower Member 2 of Dongying Formation,the southern Liaodong Bay,a set of diagonal progradation sediments is deposited,which has been considered as a forced lacustrine regression system produced mainly by a strong fall of lake level during deposition of the Member,through an analysis of refined sedimentation in singal wells and a comprehensive interpretation of 3D seismic.In the system,there are 6 deltaic progradational units overlapped each other,a series of incised valleys and some slump sediments in delta fronts,with no topset developed.All these features are similar to those of typical forced marine regression systems at home and abroad.The mechanism to develop forced lacustrine regression systems is analyzed by using a method of forward modeling.This system discovery in Member 2 of Dongying Formation may help regional interpretation and correlation for Member 1 and 2 of the Formation,and is strategically important to opening exploration thoughts and promoting stratigraphic trap searches in the southern Liaodong Bay.
In the lower Member 2 of Dongying Formation,the southern Liaodong Bay,a set of diagonal progradation sediments is deposited,which has been considered as a forced lacustrine regression system produced mainly by a strong fall of lake level during deposition of the Member,through an analysis of refined sedimentation in singal wells and a comprehensive interpretation of 3D seismic.In the system,there are 6 deltaic progradational units overlapped each other,a series of incised valleys and some slump sediments in delta fronts,with no topset developed.All these features are similar to those of typical forced marine regression systems at home and abroad.The mechanism to develop forced lacustrine regression systems is analyzed by using a method of forward modeling.This system discovery in Member 2 of Dongying Formation may help regional interpretation and correlation for Member 1 and 2 of the Formation,and is strategically important to opening exploration thoughts and promoting stratigraphic trap searches in the southern Liaodong Bay.
引文
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[4]HENRY W P,ALLEN G P,JAMES D P,et al.Forced regres-sions in a sequence stratigraphic framework:concepts,exam-ples,and exploration significance[J].Am.Assoc.Pet.Geol.Bull.,1992,76:1687-1709.
[5]NUMMEDAL D,RILEY G W,COLE R D,et al.The fallingsea level systems tract in ramp settings(Abstract),Mesozoicof the Western Interior[C].Society of Economic Paleontolo-gists and Mineralogists,Theme Meeting,Fort Collins,Colo-rado,August17-19,1992.
[6]NUMMEDAL D,GUPTA S,PLINT A G,et al.The fallingstage systems tract:definition,character and expression inseveral examples from the Cretaceous from the U.S.WesternInterior[J].Sedimentary Responses to Forced Regressions,Geological Society of London,Abstract Volume,1 9 9 5:4 5-4 8.
[7]HUNT D,TUCKER M E.Stranded parasequences and theforced regressive wedge systems tract:deposition duringbase-level fall-reply[J].Sedimentary Geology,1995:147-160.
[8]PLINT A G,NUMMEDAL D.The falling stage systemstract:recognition and importance in sequence stratigraphic a-nalysis[M]//HUNT D,GAWTHORPE R L.SedimentaryResponse to Forced Regression.Geol.Soc.London Speci.Publ.,2000,172:1-17.
[9]梅冥相,杨欣德.强迫型海退及强迫型海退楔体系域[J].地质科技情报,2000,19(2):17-21.
[10]吴因业,顾家裕,王招明,等.塔里木盆地满西区块强制海退体系域沉积模式[J].石油学报,2003,24(4):21-25.
[11]吕明.莺-琼盆地低位沉积模式的新探讨[J].中国海上油气(地质),2002,16(4):221-230.
[12]操应长,姜在兴,夏斌.幕式差异沉降运动对断陷湖盆中湖平面和水深变化的影响[J].石油实验地质,2003,25(4):323-327.
[13]操应长.断陷湖盆中强制湖退沉积作用及其成因机制[J].沉积学报,2005,23(1):84-90.
[14]项华,徐长贵.渤海海域古近系岩性地层油气藏层序地层学特征[J].石油学报,2006,27(2):11-15.
[15]ANDERSON J B,WELLNER J S,ABDULAH K,et al.LateQuaternary shelf-margin delta and slope-fan compelxes of theeast Texas-western Louisiana margin:variable response to eu-stasy and sediment supply[M]//Shelf Margin Deltas andLinked Down Slope Petroleum Systems:Global Significanceand Future Exploration Potential,23rd Annual GSSEPMFoundation,23:67-78.
[16]李丕龙,庞雄奇.陆相断陷盆地岩性地层油气藏形成——以济阳坳陷为例[M].北京:石油工业出版社,2004.
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