泌阳凹陷核桃园组三段上亚段滑塌浊积扇沉积特征
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摘要
通过对泌阳凹陷核桃园组三段上亚段岩性组合、粒度和地震反射特征的研究,认为深湖区滑塌浊积扇物源来自东北部侯庄辫状河三角洲,其岩性为灰色中砂岩、细砂岩,多夹于深灰色湖相泥岩中,与泥岩呈突变接触,地震剖面显示透镜状反射与前积反射共生,粒度概率曲线具有"低斜一段"式特征。湖平面下降有利于无外界触发机制作用下三角洲前缘滑塌浊积扇的形成。东北部三角洲前缘水体浅,当湖平面下降时,三角洲前缘出露部分因浮力消失而不稳定,可产生局部滑塌。波浪作用可以强烈剥蚀和改造浪基面附近的三角洲前缘沉积,并在波浪的回流作用下进一步形成浊积砂体。滑塌浊积扇均发育在辫状河三角洲和近岸水下扇之间的湖相泥岩中,当三角洲向前推进快、朵叶向前延伸较远时,易形成数量多、面积相对较大的滑塌浊积扇,且距离三角洲朵叶越近,滑塌浊积扇数量越多、面积越大。
Analyses of lithology assemblage,grain size and seismic reflection characteristics of the upper third member of Hetaoyuan Formation reveal that the provenance of slump turbidite fan in the deep lake came from Houzhuang braided river delta in the northeast.The slump turbidite fans are characterized by grey medium-fine sized sandstones,interbedding with dark grey lacustrine mudstone in sharp contact,coexistence of lens and progradation reflection on the seismic profile,as well as low slope and one segment of grain-size probability curve. The drop of lake level was favorable for the formation of slump turbidite fan in delta front without external triggering mechanism.As water in northeast delta front was shallow,when the lake level dropped,part of the delta front exposed and lost stability due to the lost of buoyancy,resulting in local slumping.Wave action could strongly corrode and modify delta front sediments near the wave base and resulted in the formation of turbidite sandbody due to wave back flow.All the slump turbidite fans were developed in the lake mudstones between braised river delta and nearshore subaqueous fan.When the delta pushed forward rapidly and the lobes protruded long forward,it was easy to form slump turbidite fans large in both number and area.The number of slump turbidite fans increases and their area enlarges near the delta lobes.
Analyses of lithology assemblage,grain size and seismic reflection characteristics of the upper third member of Hetaoyuan Formation reveal that the provenance of slump turbidite fan in the deep lake came from Houzhuang braided river delta in the northeast.The slump turbidite fans are characterized by grey medium-fine sized sandstones,interbedding with dark grey lacustrine mudstone in sharp contact,coexistence of lens and progradation reflection on the seismic profile,as well as low slope and one segment of grain-size probability curve. The drop of lake level was favorable for the formation of slump turbidite fan in delta front without external triggering mechanism.As water in northeast delta front was shallow,when the lake level dropped,part of the delta front exposed and lost stability due to the lost of buoyancy,resulting in local slumping.Wave action could strongly corrode and modify delta front sediments near the wave base and resulted in the formation of turbidite sandbody due to wave back flow.All the slump turbidite fans were developed in the lake mudstones between braised river delta and nearshore subaqueous fan.When the delta pushed forward rapidly and the lobes protruded long forward,it was easy to form slump turbidite fans large in both number and area.The number of slump turbidite fans increases and their area enlarges near the delta lobes.
引文
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[15]鄢继华,陈世悦,姜在兴.三角洲前缘浊积体成因及分布规律研究[J].石油实验地质.2008,30(1):16-20. Yan Jihua,Chen Shiyue,Jiang Zaixing.Genesis and distribution regularity of the turbidite bodies in the delta front[J].Petroleum Geology & Experiment,2008,30(1):16 - 20.
[16]吴小红,吕修祥,周心怀,等.黄河口凹陷浅水三角洲沉积特征及其油气勘探意义[J].石油与天然气地质,2010,31 (2):165-4172. ??Wu Xiaohong,Lv Xiuxiang,Zhou Xinhuai,et al.Depositional characteristics and hydrocarbon exploration significance of shallow deltas in the Yellow River Mouth Sag[J].Oil & Gas Geology, 2010,31(2):165 -172.
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[18]Lowe D R.Sediment gravity flows;(Ⅱ) depositional models with special reference to the deposits of the high-density turbidity currents[J].Journal of Sedimentary etroyeam,1982, 52:279-297.
[2]常炳章,张驰,曲天红,等.泌阳凹陷深凹区白云岩裂缝预测研究[J].石油天然气学报,2009,31(3):202-204. Chang Binzhang,Zhang Chi,Qu Tianhong,et al.The research of dolomite crack forecast in the sag area of the Biyang depression[J].Journal of Oil and Gas Technology,2009,31 (3):202-204.
[3]刘良刚,罗顺社,刘启亮,等.泌阳凹陷南部陡坡带核三段砂体沉积和油气分布特征[J].油气地球物理,2010,8 (4):32-37. Liu Lianggang,Luo Shunshe,Liu Qiliang,et al.Sand body deposition and reservoir distribution characteristics of the Eh~3 in the southern sleep slope zone in the Biyang depression[J]. Petroleum Geophysics,2010,8(4);32 -37.
[4]邵先杰.泌阳凹陷新庄辫状三角洲沉积体系及储集性能[J].特种油气藏.2006,13(5):22-26. Shao Xianjie.Deposition systems and reservoir properties of Xinzhuang braided delta in Biyang Depression[J].Special Oil and Gas Reservoir,2006,13(5):22-26.
[5]钟俊义.泌阳凹陷北部斜坡带三角洲沉积与油气成藏研究??[J].新疆石油天然气,2006,2(1):30-37. Zhong Junyi.A study on delta deposits and reservoir forming in the northern slope of Biyang depression[J].Xinjiang Petroleum, 2006,2(1);30-37.
[6]韦东晓,田景春,倪新锋.湖相浊积砂体沉积特征及油气勘探意义[J].油气地质与采收率,2006,13(5):15-19. Wei Dongxiao,Tian Jingchun,Ni Xinfeng.Sedimentary characteristics of lacustrine turbidite sand body and its signitiance on petroleum exploration[J].Petroleum Geology and Recovery Efficiency,2006,13(5);!5 -19.
[8]张晶,王伟峰,荣启宏,等.东营凹陷永55区块沙四上亚段深水浊积扇沉积与油气[J].吉林大学学报(地球科学版),2007,37(3):519-524. Zhang Jing,Wang Weifeng,Rong Qihong,et al.Deep-water turbidite fan deposits and relation to hybrocarbon of the Upper Sha-4 of Shahejie Formation at Yong-55 Block in Dongying Sag [J].Journal of J ilin University(Earth Science Edition ), 2007,37(3):519-524.
[9]刘桠颖,徐怀民,李林,等.准噶尔盆地阜东斜坡带深水浊积扇沉积及油气勘探意义[J].沉积与特提斯地质, 2009,29(4):29-35. Liu Yaying,Xu Huaimin,Li Lin,et al.Deep-water turbidite fan deposits and their significance for the oil-gas exploration in the eastern Fukang slope zone,Junggar basin[J].Sedimentary Geology and Tethyan Geology,2009,29(4):29 -35.
[10]姜辉.浊流沉积的动力学机制与响应[J].石油与天然气地质,2010,31(4):428-435. Jiang Hui.Dynamical mechanism and depositional responses of turbidity current sedimentation[J].Oil & Gas Geology,2010, 31(4):428-435.
[11]吴光华,王红亮,林会喜,等.渤海湾盆地埕岛地区东营组沉积特征及其油气地质意义[J].石油与天然气地质, 2009,30(1):33-40. Wu Guanghua,Wang Hongliang,Lin Huixi,et al.Sedimentary features of the Dongying Formation in Chengdao area and their geological significance[J].Oil & Gas Geology,2009,30 (1):33-40.
[12]Ivanov M K,Kenyon N H,Suzyumov A E,et al.Introduction marine geology[M].Amsterdam;Elsevier Pub,2003,195; 1 -4.
[13]魏国齐,杨威,朱永刚,等.川西地区中二叠统栖霞组沉积体系[J].石油与天然气地质,2010,31(4):442-448. Wei Guoqi,Yang Wei,Zhu Yonggang,et al.Depositional system of the Middle Permian Qixia Formation in the western Sichuan Basin[J].Oil & Gas Geology,2010,31(4):442 - 448.
[14]操应长,刘晖.湖盆三角洲沉积坡度带特征及其与滑塌浊积岩分布关系的初步探讨[J]地质论评,2007,53(4): 454-458. Cao Yingchang,Liu Hui.Discussion on the relationship between distribution of fluxoturbidite and depositional slope of delta in lacustrine basin[J].Geological Review,2007,53 (4):454-458.
[15]鄢继华,陈世悦,姜在兴.三角洲前缘浊积体成因及分布规律研究[J].石油实验地质.2008,30(1):16-20. Yan Jihua,Chen Shiyue,Jiang Zaixing.Genesis and distribution regularity of the turbidite bodies in the delta front[J].Petroleum Geology & Experiment,2008,30(1):16 - 20.
[16]吴小红,吕修祥,周心怀,等.黄河口凹陷浅水三角洲沉积特征及其油气勘探意义[J].石油与天然气地质,2010,31 (2):165-4172. ??Wu Xiaohong,Lv Xiuxiang,Zhou Xinhuai,et al.Depositional characteristics and hydrocarbon exploration significance of shallow deltas in the Yellow River Mouth Sag[J].Oil & Gas Geology, 2010,31(2):165 -172.
[17]Stow D A V,Mayll M.Deep - water sedimentary system;New models for the 21 st century[J].Marine and Petroleum Geology, 2000,17(2):125 -135.
[18]Lowe D R.Sediment gravity flows;(Ⅱ) depositional models with special reference to the deposits of the high-density turbidity currents[J].Journal of Sedimentary etroyeam,1982, 52:279-297.
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