DEPOSITIONAL ENVIRONMENTS OF LACUSTRINE OILSHALES AND ITS SEQUENCE STRATIGRAPHY SIGNIFICANCE
-
摘要: 按照沉积环境,湖相油页岩可分为浅湖和深湖两种类型。前者可根据于盐湖模式、外因分层湖模式和浅盐湖模式来解释;后者则与分层湖作用有关。无论是浅湖还是深湖油页岩,在纵向上它们都位于湖侵-湖退旋回(规模可大可小)的中部。作为陆相地层中的“密集段”之一,油页岩是否可作为区分水进体系域和高水位体系域的标志(最大洪泛面或最大洪泛带),取决于它们在层序中所处的位置以及该油页岩层之上是否还有其他密集段的存在。Abstract: Lacustrine oil shales can be divided into shallow lake and deep lake deposits in termsof their sedimentary environments. The former can be playa, ectogenic meromictic andshallow saline lakes; and the later is related to stratified lake. The oil shales are located inthe middle part of a transgressive-regressive cycle (whose scale is variable), whether theyare shallow or deep lake oil shales in origin. As one of condensated sections of continentalstrata, if oil shales can be marks between transgressive system tract and highstand systemtracts (the maximum flooding surface or the maximum flooding zone) depends on their position in the sequence and on if there is other condensated section above the shales.
-
[1] 何起祥.沉积岩和沉积矿床.北京:地质出版社.1978 [2] 王东坡,刘招君,刘立.松辽盆地的演化与海平面升降.北京:地质出版社,1994 [3] 王东坡,刘立.大陆裂谷盆地层序地层学研究.岩相古地理,1994.14(3);1-9 [4] 王东坡,刘立,张立平,吕传江.松辽盆地的古气候,沉积旋回与层序地层.长春:吉林大学出版社,1995 [5] 魏魁生,徐怀大.二连盆地白垩系非海相沉积层序地层特征.地球科学,1994.19(2):139-149 [6] Boyer B W. Green river laminites, Does the playa-lake model really invalidate the stratified-lake model? Geology.1982,10:321-324 [7] Bradely W H and Eugster H P. Geochemistry and paleoclimnology of the irons deposits and associated authigenic minerals of the Green River Formation of Wyoming, U. S. Geological Survey professional paper 803. 1969,53P [8] Carroll A R, Brassell S C and Graham S A. Upper Permian Lacustrine oil shales, Southern Junggar Basin. North-west China. AAPG Bulletin, 1992,76(12):1874-1902 [9] Desborough G A. A biogenic-chemical stratified lake model for the origin of oil shale of the Green River Formation,An atternative to the playa-lake model. Geological Society of American Bulletin. 1978. 89,961-971 [10] Eugster H P and Surdam R C. Depositional environment of the Green River Formation of Wyoming, A preliminary report. Geological Society of America Bulletin. 1973. 84, 1115-1120 [11] Fischer A G and Roberts L T. Cyclicity in the Green River Formation (lacustrine Eocene) of Wyoming. Journal of Sedimentay Petrology. 1991.61(7);1146-1154 [12] Shanley K Wand McCabe P J. Perspectives on the sequence stratigraphy of coontinental strata. AAPG Bulletin,1994, 78(4):544-568 -
计量
- 文章访问数: 822
- HTML全文浏览量: 67
- PDF下载量: 513
- 被引次数: 0