Regional Interbasinal Fourth-Order Sequence Stratigraphy, Late Mississippian, Illinois to Appalachian Basins: ABSTRACT

By using the data of core, geological log and seism and the theory of sedimentology and sequence stratigraphy , the sequence of Shahezi formation in Xujiaweizi depression are divided into five third-order sequence, they are SQ1, SQ2, SQ3, SQ4 and SQ5 up towards. The range of SQ1 is limited, influenced by palaeogeomorphology. SQ5 are greatly influenced by the late sedimentary denudation, now only in the northwest of the study area can be seen, other part is missing in this layer. SQ1, SQ2, SQ3 are onlap filled. There are defective area in SQ4 and SQ5.

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Third-Order Sequence Division of Yunmengshan and Baicaoping Formation of Proterozoic in Yuxi District of China: an Example from Xiatang Profile in Lushan

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.998-999.1492 ◽

2014 ◽

Vol 998-999 ◽

pp. 1492-1497

Author(s):

He Yuan Wu ◽

Bin Hao

Keyword(s):

Sequence Stratigraphy ◽

North China Craton ◽

North China ◽

Sedimentary Facies ◽

Actual Data ◽

Third Order ◽

Facies Change ◽

Order Sequence

There are controversies on the Proterozoic stratigraphic genesis, division, correlation and palaeogeographical evolution of western Henan in China. Based on the basic description of sedimentary facies, Yunmengshan and Baicaoping formation of Proterozoic typical section in western Henan is divided into 4 third-order sequences. Sequence stratigraphy framework which reflects sedimentary and overlap is established with basis of two kinds of facies-change surface and two kinds of diachrononism in stratigraphical records. Although chronostratigraphic belonging of Precambrian strata is controversial and Precambrian sequential stratigraphic study is tremendously challenging, the establishment of sequence stratigraphy framework of proterozoic Yunmengshan and Baicaoping formation in western Henan provides actual data to reshape palaeogeographic pattern of Palaeoproterozoic North China craton. What is more, it becomes a typical example of characteristics and exploration of stratigraphic accumulation under the background of tidal action.

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The third order sequence stratigraphy of the Itararé Subgroup (late Paleozoic) across Paraná Basin

Anais da Academia Brasileira de Ciências ◽

10.1590/s0001-37652002000300018 ◽

2002 ◽

Vol 74 (3) ◽

pp. 541-541

Author(s):

JOSÉ R. CANUTO ◽

PAULO R. SANTOS ◽

ANTONIO C. ROCHA-CAMPOS

Keyword(s):

Sequence Stratigraphy ◽

Late Paleozoic ◽

Third Order ◽

The Third ◽

Paraná Basin ◽

Parana Basin ◽

Order Sequence

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Sequence Stratigraphy Analysis Based on Wireline Log, Mudlog, and 2D Seismic of GHC Field, Baong Formation, Aru Sub Basin, North Sumatra Basin

Proc. Indon. Petrol. Assoc., Digital Technical Conference, 2020 ◽

10.29118/ipa20-sg-229 ◽

2020 ◽

Author(s):

G. C. Yulitha

Keyword(s):

Sequence Stratigraphy ◽

Oil And Gas ◽

Lower Boundary ◽

Research Area ◽

Geological Processes ◽

Geological Information ◽

Maximum Flooding Surface ◽

Order Sequence ◽

North Sumatra ◽

System Tract

The Baong Formation is one of the formations that has hydrocarbon potential in the Aru Sub Basin, North Sumatra Basin (Figure 1). However, geological information in that area is still far less than is available in others. Analysis of sequence stratigraphy needs to be done to enrich geological information of the study area, maximize the results of exploration before exploitation, and make it easier to find the distribution of potential layers of oil and gas. Methods that are used in this research are electrofacies analysis to show the appearance of rock grain size and geological processes that affect its formation, Well Seismic Tie and interpretation of the horizon along with structures to produce a Time Structure Map, and correlate the sequences in log wells and 2D seismic cross section to know the same area of each sequence. Based on third-order sequence, the Baong Formation was divided into two types of system tract, such as Lowstand System Tract (LST) and Transgressive System Tract (TST). Maximum Flooding Surface (MFS) as the lower boundary of LST, Transgressive Surface (TS) as the boundary between LST and TST, and Maximum Flooding Surface as the upper boundary of TST. Based on fourth-order sequence, each of the system tracts was divided into seven parasequences with Flooding Surface as the boundary. The research area can also be interpreted into a conceptual model of a hydrocarbon system.

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Formation mechanism of dolomite reservoir controlled by fourth-order sequence in an evaporated marine environment – An example from the Lower Ordovician Tongzi Formation in the Sichuan Basin

Energy Exploration & Exploitation ◽

10.1177/0144598717736630 ◽

2017 ◽

Vol 36 (4) ◽

pp. 620-644 ◽

Cited By ~ 2

Author(s):

Dongya Zhu ◽

Dianwei Zhang ◽

Quanyou Liu ◽

Fengcun Xing ◽

Zhiliang He ◽

...

Keyword(s):

Fourth Order ◽

Sichuan Basin ◽

Meteoric Water ◽

High Energy ◽

Tectonic Uplift ◽

High Porosity ◽

Lower Ordovician ◽

The Sichuan Basin ◽

Sequence Boundaries ◽

Order Sequence

The high-porosity dolomite reservoirs of the Lower Ordovician Tongzi Formation (Fm.) were widely developed in the Sichuan Basin of southern China. The characteristics and developing mechanisms of the high-porosity dolomite reservoirs under the control of fourth-order sequence boundaries are discussed. In the Tongzi stage of the Early Ordovician, the Sichuan Basin was in a restricted platform facies in an evaporated shallow seawater environment. From the western to eastern regions of the basin, the Tongzi Fm. was serially developed in a tidal flat-lagoon-high-energy shoal depositional system. The evaporated seawater consequently led to dolomitization by way of the refluxing model. The Tongzi Fm. dolomites were subdivided into four coarsening-upward fourth-order sequences. Many tiny dissolution pores were formed in the dolomite beneath the four fourth-order sequence boundaries due to syn-sedimentation meteoric water erosion. Exposure above the seawater due to the short-term fall of the relative sea level consequently led to contemporaneous meteoric erosion. The Tongzi Fm. dolomites in the belt surrounding the Central Paleo-uplift were further subaerially dissolved by meteoric water due to tectonic uplift in the Guangxi Movement since the end of the Silurian period. Therefore, dolomitization, syn-sedimentation meteoric erosion under the fourth-order sequence boundaries, and meteoric karst during the Guangxi tectonic uplift jointly controlled the development of the Tongzi Formation high-porosity dolomite reservoirs. In the eastern and southeastern Sichuan Basin, the favourable reservoirs are the high-energy shoal dolomites that were eroded by meteoric water under fourth-order sequence boundaries. Around the Central Paleo-uplift, the favourable reservoirs are the dolomites dissolved by subaerial meteoric karst during the Guangxi Movement.

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