轨道周期约束下海-陆过渡相页岩层系高精度层序界面识别及其地质意义

doi:10.11743/ogg20230512

Abstract

Abstract:

The marine-continental transitional shale is of good exploration prospect， but it is difficult to construct a high-resolution sequence stratigraphic framework due to its multiple pay zones， and thin single-layer thickness with rapid lithofacies change. The theory of cyclostratigraphy provides an effective means for the division and correlation of high-frequency cycles. The study determines the high-resolution sequence boundary of marine-continental transitional shale in the 2³ sub-member of Shanxi Formation （Shan 2³ sub-member） at the eastern margin of Ordos Basin， based on core analysis and logging data， combined with the high-resolution sequence stratigraphy and cyclostratigraphy. The GR， Th/U and TOC sequences of the Shan 2³ sub-member are applied to obtain the astronomical parameters recorded in the sediments by filtering. A comprehensive analysis of the sub-member in terms of lithology， logging and geochemical elements serves to identify fourth-order sequence boundaries. The 405 kyr long eccentricity cycle has a good coupling relationship with the fourth-order sequences， and the sub-member can be divided into four fourth-order sequences （PSQ1—4）. According to the relationship between the short eccentricity and the fifth-order sequence， the sub-member can be sub-divided into 12 fifth-order sequences （FSQ1—12）. On this basis， we analyze the coupling relationship of orbital cycle with high-resolution sequence， sea level fluctuation， sedimentary environment evolution and lithofacies association. The long eccentricity cycle controls the evolution of sedimentary environment （facies） by adjusting 0.4 Myr scale sea level change， and affects the development of dominant shale reservoirs； while the short eccentricity cycle controls the evolution of sedimentary environment （sub-facies） by adjusting the sea level change of 0.1 Myr scale， and affects the development of shale reservoir sweet spots. In all， the high-resolution sequence division and correlation technology of shale strata as proposed in cyclostratigraphy， can be of theoretical reference and technical support to precisely identifying dominant shale and geo-steering design of horizontal wells.

Key words: astronomical orbital cycle, cyclostratigraphy, high-resolution sequence, marine-continental transitional shale, Shanxi Formation, Ordos Basin

CLC Number:

TE121.3

Yueli LIANG, Xiaoming ZHAO, Xi ZHANG, Shuxin LI, Jiawang GE, Zhihong NIE, Tingshan ZHANG, Haihua ZHU. Orbital forced high-resolution sequence boundary identification of marine-continental transitional shale and its geological significance： A case in Shan 2³ sub-member at the eastern margin of Ordos Basin[J]. Oil & Gas Geology, 2023, 44(5): 1231-1242.

Figures/Tables 11

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井号	优势旋回厚度/m	优势旋回厚度比	天文旋回厚度/m
井号	优势旋回厚度/m	优势旋回厚度比	405 kyr长偏心率周期	107～123 kyr短偏心率周期		41～46 kyr斜率周期
A1	11.88/3.25/2.87/1.29	20.0/5.5/4.8/2.0	11.88	3.25	2.87	1.29
A2	14.90/3.95/1.93	20.0/5.3/2.6	14.90	3.95	3.95	1.93
A3	18.72/5.30/4.07/1.88	20.0/5.7/4.4/2.0	18.72	5.30	4.07	1.88
A4	16.10/4.66/3.72/1.78	20.0/5.8/4.6/2.0	16.10	4.66	3.72	1.78

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Orbital forced high-resolution sequence boundary identification of marine-continental transitional shale and its geological significance： A case in Shan 2³ sub-member at the eastern margin of Ordos Basin

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Orbital forced high-resolution sequence boundary identification of marine-continental transitional shale and its geological significance： A case in Shan 23 sub-member at the eastern margin of Ordos Basin

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Orbital forced high-resolution sequence boundary identification of marine-continental transitional shale and its geological significance： A case in Shan 2³ sub-member at the eastern margin of Ordos Basin