High-resolution Stratigraphic Division and Formation Model of the Callovian-Oxfordian Sequences in the Central Part of Block B in the Right Bank of Amu Darya Basin, Turkmenistan

doi:10.19657/j.geoscience.1000-8527.2018.05.06

Abstract

Abstract:

The Amu Darya Basin in Turkmenistan is a large petroliferous sedimentary basin, yet its Callovian-Oxfordian stratigraphic division and correlation are still disputed. We analyzed the Callovian-Oxfordian sequences in Block B of the Amu Darya right bank area (based on Vail’s classic sequence stratigraphy and relevant sedimentology theories), integrating drill core, logging, seismic, thin section petrographic, and geochemical data. We found that the Callovian-Oxfordian sequences can be divided into five 3^rd order sequences and 15 4^th order sequences. Stratigraphy framework for the study area is newly established based on these high-resolution sequence divisions. Two carbonate platform models were developed: (i) Callovian, the region was likely a ramp platform with topographic highs in the west and lows in the east, and a gradual slope gradient with spatially consistent sedimentation rate; (ii) Oxfordian, the region was likely evolved into a rimmed platform system, with highly disparate sedimentation rates (low in the east) that were sensitive to sea level change, and a starkly different sedimentary landform that was high in the west and low in the east.

Key words: Amu Darya Basin, Callovian-Oxfordian, stratigraphic division, carbonate platform, sequence stratigraphic model

CLC Number:

WU Chongyang, YU Bingsong, WANG Hongjun, RUAN Zhuang, CHENG Chuanjie, GUO Tongcui, ZHANG Liangjie, CHENG Muwei. High-resolution Stratigraphic Division and Formation Model of the Callovian-Oxfordian Sequences in the Central Part of Block B in the Right Bank of Amu Darya Basin, Turkmenistan[J]. Geoscience, 2018, 32(05): 924-937.

Figures/Tables 10

References 41

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岩性	埋深/m	Mn/10^-6	Sr/10^-6	Mn/Sr	δ¹³C_PDB/‰	δ¹⁸O_PDB/‰
生屑微晶灰岩	3 469.51	92	310	0.3	0.545	-0.334
生屑微晶灰岩	3 472.93	97	280	0.35	2.102	-0.729
生屑微晶灰岩	3 476.74	97	210	0.46	3.185	-1.248
微晶生屑灰岩	3 481.55	97	360	0.27	2.887	-1.324
生屑微晶灰岩	3 486.32	78	210	0.37	3.073	-1.628
生屑微晶灰岩	3 491.04	150	220	0.68	2.737	-1.09
白云化生屑灰岩	3 495.05	71	250	0.28	2.845	-1.928
含生屑微晶灰岩	3 499.55	52	190	0.27	3.53	-0.981
含生屑微晶灰岩	3 501.13	53	190	0.28	2.93	-1.574
生屑微晶灰岩	3 504.55	65	190	0.34	2.505	-2.045
生屑微晶灰岩	3 509.88	70	200	0.35	3.437	-1.393
生屑微晶灰岩	3 511.83	100	230	0.43	3.082	-1.416
生屑微晶灰岩	3 520.14	65	180	0.36	3.614	-0.61
含生屑微晶灰岩	3 526.35	64	200	0.32	3.732	-1.731
含生屑微晶灰岩	3 529.2	46	190	0.24	3.751	-0.908
含生屑微晶灰岩	3 531.39	53	200	0.27	3.955	-0.598
含生屑微晶灰岩	3 536.45	48	180	0.27	4.269	-1.076
含生屑微晶灰岩	3 544.48	59	180	0.33	4.001	-0.782
生屑微晶灰岩	3 549.12	52	200	0.26	4.151	-0.704
生屑微晶灰岩	3 555.52	76	180	0.42	4.146	-0.746
微晶生屑灰岩	3 562.92	110	260	0.42	4.081	-2.261
含生屑微晶灰岩	3 565.75	66	190	0.35	4.169	-0.896
含生屑微晶灰岩	3 568.2	88	210	0.42	4.28	-0.864
微晶生屑灰岩	3 577.02	66	190	0.35	4.219	-1.084
微晶生屑灰岩	3 581.54	48	220	0.22	3.804	-0.893
含生屑微晶灰岩	3 590.67	150	200	0.75	4.23	-1.044
含生屑微晶灰岩	3 592.63	150	220	0.68	4.327	-1.063
含生屑微晶灰岩	3 595.71	60	200	0.30	4.582	-0.116
含生屑微晶灰岩	3 596.28	80	210	0.38	3.992	0.299
含生屑微晶灰岩	3 598.29	68	220	0.31	4.27	-0.812
含生屑微晶灰岩	3 602.09	85	220	0.39	4.213	-0.637
含生屑微晶灰岩	3 608.88	120	220	0.55	4.373	-0.158
微晶生屑灰岩	3 616.48	75	190	0.39	4.41	-1.390

岩性	埋深/m	Mn/10^-6	Sr/10^-6	Mn/Sr	δ¹³C_PDB/‰	δ¹⁸O_PDB/‰
生屑微晶灰岩	3 469.51	92	310	0.3	0.545	-0.334
生屑微晶灰岩	3 472.93	97	280	0.35	2.102	-0.729
生屑微晶灰岩	3 476.74	97	210	0.46	3.185	-1.248
微晶生屑灰岩	3 481.55	97	360	0.27	2.887	-1.324
生屑微晶灰岩	3 486.32	78	210	0.37	3.073	-1.628
生屑微晶灰岩	3 491.04	150	220	0.68	2.737	-1.09
白云化生屑灰岩	3 495.05	71	250	0.28	2.845	-1.928
含生屑微晶灰岩	3 499.55	52	190	0.27	3.53	-0.981
含生屑微晶灰岩	3 501.13	53	190	0.28	2.93	-1.574
生屑微晶灰岩	3 504.55	65	190	0.34	2.505	-2.045
生屑微晶灰岩	3 509.88	70	200	0.35	3.437	-1.393
生屑微晶灰岩	3 511.83	100	230	0.43	3.082	-1.416
生屑微晶灰岩	3 520.14	65	180	0.36	3.614	-0.61
含生屑微晶灰岩	3 526.35	64	200	0.32	3.732	-1.731
含生屑微晶灰岩	3 529.2	46	190	0.24	3.751	-0.908
含生屑微晶灰岩	3 531.39	53	200	0.27	3.955	-0.598
含生屑微晶灰岩	3 536.45	48	180	0.27	4.269	-1.076
含生屑微晶灰岩	3 544.48	59	180	0.33	4.001	-0.782
生屑微晶灰岩	3 549.12	52	200	0.26	4.151	-0.704
生屑微晶灰岩	3 555.52	76	180	0.42	4.146	-0.746
微晶生屑灰岩	3 562.92	110	260	0.42	4.081	-2.261
含生屑微晶灰岩	3 565.75	66	190	0.35	4.169	-0.896
含生屑微晶灰岩	3 568.2	88	210	0.42	4.28	-0.864
微晶生屑灰岩	3 577.02	66	190	0.35	4.219	-1.084
微晶生屑灰岩	3 581.54	48	220	0.22	3.804	-0.893
含生屑微晶灰岩	3 590.67	150	200	0.75	4.23	-1.044
含生屑微晶灰岩	3 592.63	150	220	0.68	4.327	-1.063
含生屑微晶灰岩	3 595.71	60	200	0.30	4.582	-0.116
含生屑微晶灰岩	3 596.28	80	210	0.38	3.992	0.299
含生屑微晶灰岩	3 598.29	68	220	0.31	4.27	-0.812
含生屑微晶灰岩	3 602.09	85	220	0.39	4.213	-0.637
含生屑微晶灰岩	3 608.88	120	220	0.55	4.373	-0.158
微晶生屑灰岩	3 616.48	75	190	0.39	4.41	-1.390