The Two Ordovician Unconformities in N. China Their Origins and Related Regional Reservoirs Prediction
-
摘要: 发育于下奥陶统亮甲山组顶部（UF1）和中奥陶统马家沟组或峰峰组顶部（UF2）的两个不整合面是控制华北早古生代与古岩溶有关的区域性储层形成及展布的关键性面。UF1F2原被认为分别代表了短期或长期的基底构造隆升，但是，基于新的证据，我们认为二者受控于不同成因机制，因而与之相关的储层预侧也应有所不同。UF１原被解释为是板块南部基底上翘的结果，但层序地层分析却支持其海平面变动成因解释。海面下降会通过切蚀水平岩层产生一个倾向盆地的卡斯特侵蚀斜面。UF1从西北仅蚀亮甲山组到东南下切至下寒武统顶部。因此，与之相关的储层亦从西北至东南发育于相应层位内。在空间上，有利区域性储层主要分布于强烈混合带白去化并有随后轻度淡水淋滤的华北地区中心地带。UF2由全球性构造事件形成。这一构造运动导致板块内部下弯及相应的边缘上凸，在下凹的华北中心地带保存了较新的地层（峰峰组），而在凸起区这些新地层却被天水侵蚀殆尽。与UF2有关的潜在区域性储层趋于分布在边缘抬升区，特别是峰峰组分布的周边地区。Abstract: The two unconformities developed on the tops of Lower Ordovician Liangjashan Fm(U F1)and M a-jagou or the Middle Ordovician Fengfeng Fm(UF2) are essential boundaries that controlled the formationand distribution of the Early Paleozoic karstification related reservoirs. U F1 and U F2 have beeninterpret-ed to represent short and long terms of tectonic uplift, respectively，but the new evidence led us to con-clude that they were crested by different original mechanisms and therefore the related reservoirs shouldbe predicted in different ways. UF1 was commonly interpreted as the result of southern upwarping ofbasement, but sequence stratigraphic analysis supports its origin of eustatic sealevel changes. Sealeve1fall can produce a tilted karst denudation plane dipping basinward by truncating horizontal strata. TheU F1 cut Liangjashan Fm. in the NW and gradually went down to the top of Upper Cambrian Series inthe S Etherefore, the related reservoirs〔orrespon dingly developed in these different strata from NW to SESp atially，the most favorable regional reservoirs should be located in the central area of N. China,where the carbonate sediments experienced dolotion with the following light leaching. UF2was cre-ated by global event that resulted in the intraplate downward flexure, and subsequent perispheral bulge.The younger strata(Fengfeng Fm.)were protected in the concave belt of central N.China and erodedaway by the meterior water along the bulge. As a result, the potential regional reservoirs related rocksof Fengfeng Fm. and the potential regional reservoirs related to U F2 are likely to distribute along the pe-ripheral uplift belts, especially around the remanent Fengfeng Fm.
-
Key words:
- nnconformity /
- sealevel change /
- karstification /
- reservoir
-
[1] 1 王英华.张秀莲.杨承运.华北地台早古生代碳酸盐岩岩石学.北京:地震出版社.1989. 144.
2 刘波工英华.华北地区下古生界储层的层序地层学解释.见:王英华鲍志东.朱筱敏编.沉积学及岩相古地理学新进展.北京:石油工业出版社.1995.366-368.
3 冯增昭等华北地台早古生代岩相古地理.北京:地质出版社.1990, 270.
4 许效松.层序不整合界而的综合标志与盆地性质.见:王英华，鲍志东朱筱敏编.沉积学及岩相古地理学新进展.北京:石油工业出版社.1995.442- 445.
5 李思田林畅松.杨士恭等.鄂尔多斯盆地中生代层序地层及构造一地层分析.见:王英华鲍志东.朱筱敏编.沉积学及岩相古地理学新进展.北京:石油工业出版社.1995.390- 392
6 孟祥化.沉积建造及其共生矿床分析t北京:地质出版社.1979.
7 陈霞徐辉.华北地台奥陶系碳酸盐岩储集岩成因类型与展布.沉积学报.1994, 12( 3): 47- 55.
8 G巴多西著顶仁杰.吴振寰.史业新译.岩溶型铝土矿(碳酸盐岩上的铝土矿床)t北京:冶金工业出版社.
9 Bates R L and,Jackson,J A(eds). Glossary of geology. FallsChurch, Virginia American Geological Institute, 1980, 749.
10 Cater J M L and Gillcrist J R.Karstic reservoirs of the Mid-Cretuczous Mardin Group, SL, Turkey: Tectonic and eustatic controls on their genesis, distribution and preservation. Journal of Petroleum Geology, 1994, 17(3): 253- 278.
11 Dunbar C 0 and Rodgers J. Principles or stmtigraphy. New York Wilev. 1957, 356.
12 Jacobi D R Peripheral Bulgea Causal Mechanism for the Lower/ Middle Ordovician unconformity along the U'estern margin of the Northern Applachians. L,arth and Planetary Science Letters, 1981, 56 245- 251.
13 Krumbein W C and Sloss L L. Stratigraphy and sedimenta-lion. San 1'rancisco W H freeman and Cnmpany. 1963,660
14 Miall A D. Principles of Se山mentary Basin Analysis. N ewYork Springer-Verlag.1984. 490.
15 Miller E G and Parkman field. Williston Basin. Sack atch ew arc ln King R E (ed) t Stratigraphic oil and gas fields-classification, exploration methods and case histories. AAPG Memoir. 1972. 16 502- 510.
16 Nickel E Alluvial-fan carbonate fades with evaporites,L.ocene Guarga l'onnation, Southern Pyrenees,Spain. Secl-imentology, 1982, 29 761-796
17 Saller H A, Budd A D and Harris M P.Unconformities and porosity development in carbonate strata Ideas from a Hed- berg Conference. AAPG Bulletin, 1994, 78( 6): 857- 872.
18 Shanmugam G. Origin recognition and importance of erosional unconformities in sedimentary basins. In Kleinspehn K L and Paola C(eds).New Perspectives in Basin Analysis. New York Springer-Verlag, 1988, 83-108.
19 Sun S Q. Dolomite ReservoirsPorosity Evolntion and Reser-voir Characteristics. AAPG Bulletin, 1995, 79( 2): 186一204.
20 Vail P R and Mitchum R M Jr Seismic stratigraphy andglobal changes of sea level,far 1Oven-iewIn pavton C Seismic Stratigraphy-Applications Hydrocarbonploration. AAPG M emoir, 1979, 26 51-52 -
点击查看大图
计量
- 文章访问数: 600
- HTML全文浏览量: 4
- PDF下载量: 510
- 被引次数: 0
下载:
