| Author's Name: ZHANG Tianze1,3, HUANG Wensong1, ZHU Houqin1, ZHANG Wenqi1, ZHANG Hongwei1,
JIANG Lingzhi1, WANG Wenwen1, WANG Siqi1, JIANG Ziwen1, LUO Min2,
GONG Xinglin2, YANG Tangbin2, GUO Shengli3 |
| Institution: 1. PetroChina Research Institute of Petroleum Exploration and Development; 2. CNPC (Turkmenistan) Amu Darya River Gas Company; 3. China National Oil and Gas Exploration and Development Company Ltd |
| Abstract: |
| The development potential of the Middle-Upper Jurassic Callovian-Oxfordian carbonate rocks in the western
right bank of the Amu Darya River in Central Asia is limited by the poor understanding of the distribution of intraplatform shoals. Based on the high-frequency sequence division technology of INPEFA and wavelet transform, the highfrequency sequence stratigraphic framework is established. Through the integrated use of 3D seismic data, the planar
distribution of the platform shoal is systematically described and its vertical evolution pattern is studied. The results show
that: (1)The Callovian-Oxfordian in the study area can be divided into 5 third-order sequences and 15 fourth-order
sequences. The Oxfordian is composed of 3 third-order sequences and 9 fourth-order sequences. The Callovian is
composed of 2 third-order sequences and 6 fourth-order sequences, which are significantly affected by the
paleotopographic differences and have locally developed onlap deposits. (2) Six types of lithofacies are mainly developed
in the study area, including granular limestone and grain-bearing lime mudstone to silt-sized crystalline limestone. In the
early stage, it is a carbonate gentle slope model, and the water body deepens from west to east. In the late stage, it
transitions to a restricted platform-evaporation platform model, and multiple sets of shoal thin layers are developed. (3)
During the Callovian-Oxfordian period, the water body continued to become shallow, and the shoal development
exhibited a stage-wise enhancement. The sedimentary evolution shows that the XVac, XVp and XVm formations
represent the peak intervals of shoal facies development, and the intra-platform shoals generally show the characteristics
of vertical stacking patterns and lateral amalgamation during the late stages. |
| Keywords: INPEFA；wavelet transform；high-frequency sequence stratigraphy；intra-platform shoal；Middle-Upper
Jurrasic；right bank of Amu Darya River |
|
投稿时间：
2025-06-30 |
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