Abstract
Bohai L oilfield develops a complex fluvial sedimentary system, which includes many types of fluvial sedimentary facies. Based on the coring well of oil field, the distribution characteristics of mudstone are analyzed, it is shown that the mudstone has similar internal structure and can be classified into four types according to its color: gray to grayish, variegated, brown to gray-brown and khaki, the assemblage has a large gray to grayish mudstone section, large gray to grayish mudstone intercalated thin layer sandstone, gray to grayish mudstone associated with variegated (brown) mudstone, grayish mudstone associated with lacustrine sand grain bedding sandstone, concomitant generation of large staggered bedding sandstone and grayish mudstone, mixed (gray-brown) mudstone associated with large staggered bedding sandstone, interaction between different colors of mudstone and sandstone and large interlaced sandstone intercalated with thin layer mudstone. The mudstone color is mainly gray and grayish, and very few oxidized mudstone is developed alone, which indicates that fluvial mudstone may be formed in the reductive environment in humid climate, and the fluvial mudstone in this area may be formed in the oxidizing environment, which is different from the general understanding of fluvial facies, the oxidation color is the result of the later transformation.
Highlights
It is generally considered that mudstone varies greatly in different backgrounds and can be used to indicate sedimentary environment
The core observation of continuous coring section in L Oilfield shows that the fluvial sedimentary system is not so simple, and its interior may be composed of complex sedimentary systems by various environments, including fluvial facies, inter fluvial depressions, lakes, etc, a combination of delta and interfluvial flood plains, not just fluvial systems
It may indicate that the fluvial facies is not necessarily what we originally considered to be the product of the exposed environment, but it may be the interaction between the reducing environment and the exposed environment
Summary
It is generally considered that mudstone varies greatly in different backgrounds and can be used to indicate sedimentary environment. The core observation of continuous coring section in L Oilfield shows that the fluvial sedimentary system is not so simple, and its interior may be composed of complex sedimentary systems by various environments, including fluvial facies, inter fluvial depressions, lakes, etc, a combination of delta and interfluvial flood plains, not just fluvial systems. The mudstone in this system may be different from our original understanding, it is deposited in a reductive environment, but it may eventually manifest itself in an oxidizing or reducing environment, which is controlled by the syngenic environment after its deposition, in different syngeneic environment performance for different characteristics
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