Abstract
In this study, due to the inconsistencies in the understanding of the sedimentary types in the second section of the Dongying Formation (Ed2) and the third section of the Shahejie Formation (Es3) in the middle and deep strata of Nanpu No. 3 structural area, the depositional characteristics of the deep braided river delta, fan delta, deep-water slump turbidite fan, and coastal and shallow lake in the Nanpu No. 3 structural area were examined in-depth. The investigations were begun based on the descriptions and observations of core samples obtained from eight cored wells in the study area, in combination with seismic, well logging, and rock ore data. The results revealed that the sources of the material in the study area originated from the Shaleitian salient in the southwest direction. It was determined that the fan deltas and the shallow lake sedimentary system had developed during the SQ1 sequence and SQ2 sequence periods. The braided river deltas and the shallow lake and turbidite sedimentary system with multi-stage superposition had developed during the SQ3 to SQ7 sequence periods, and their distribution range had been controlled by the structural background of the gentle slope zone of the lake basin. On that basis, a sequence deposition filling model controlled by a slope break zone in the middle and deep strata of the Nanpu No. 3 structural area was established in this study starting from the typical seismic profile, in which such factors as the tectonic activity characteristics, lake basin boundary shape, water depths, and so on, were comprehensively considered. The goal of this research investigation was to provide beneficial information for oil and gas explorations in similar areas.
Highlights
The Nanpu Sag is a type of Mesozoic-Cenozoic superimposed compound sag located in the northern section of the Huanghua Depression in the Bohai Bay Basin
The main sedimentary facies and sedimentary evolution characteristics of the Nanpu No 3 structural area were systematically examined in accordance with the observations and descriptions of 168 m cores taken from 14 cored wells in Nanpu No 3 structural area, in combination with the seismic data, logging data, and testing data
It is believed that the material sources of the Nanpu No 3 structural area mainly originate from the Shaleitian Salient area in the southwestern direction (Figure 3C), and the material source openings are distributed in the developmental parts of the main fault in the north-eastern direction
Summary
The main sedimentary facies and sedimentary evolution characteristics of the Nanpu No 3 structural area were systematically examined in accordance with the observations and descriptions of 168 m cores taken from 14 cored wells in Nanpu No 3 structural area, in combination with the seismic data, logging data, and testing data Such factors as the tectonic activity characteristics, boundary fault morphology, climate conditions, water depth, and so on, were comprehensively considered. The Nanpu No 3 structural area is a fault anticline structure developed on a Cambrian buried hill, which is characterized by the Paleogene Shahejie formation, Dongying Formation, Neogene Guantao Formation, Minghuazhen Formation, and a quaternary plain formation in turn above it This is a lack of Paleozoic to Mesozoic strata in the area. The sequence stratigraphy and sedimentology were studied, the provenance direction was clarified, and the sedimentary characteristics and filling mode of the gentle slope zone in the study area were analyzed
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