Investigation of fractures and in situ stresses using Formation Micro Imaging (FMI) in south-western Iranian hydrocarbon field

Authors

1 Faculty of New Sciences and Technologies, Department of Petroleum Engineering, Semnan University

2 Geophysics Branch of the Geology Department, National Iranian South Oil Company, Iran

Abstract

Identification Tiny Wall Effects Has Always Been Important for Oil Engineers, as These Are Useful Tools for Regional Tectonic Studies and Have a Significant Impact on Oil/Gas and Reservoir Quality. In Fractured Zones, Good Information Can Be Obtained Directly and Indirectly Using Seismic Information, Petrophysical Logs, Wellhead Experiments, Drilling Mud History and Core Description. In This Research, Using the FMI Diagram in Geolog Software, Different Types of Open and Closed Fractures, Layering Boundary, Fault and Stylolite and Borehole Breakouts were identified and Their Properties were discussed. 1829 Open Fractures Were Detected by Detecting the FMI Dynamic Image in the Study Well, Most of Which Lack Continuity and Opening for Identification. 69 Closed Fractures were identified. In this study, 430 Boundary layers were read, most of which were detected at high confidence interval. Two Potential Faults were identified at the Study Intervals, Both of Which Caused Dip Changes and Abrupt Texture Changes. The Stylolite Identified in the Study Well Were 12 Total, Most of Them Having Short Amplitude and Parallel Stratification. Based on the interpretations made to determine in situ stresses at different depths of the breakouts wells, 140 fractures were identified. The breakouts, which indicate the direction of least stress (σh), are along the NW-SE and are consistent with the usual Zagros trend. In addition, 128 inductive fractures were detected in the studied well. This type, which indicates maximum horizontal stress (σH), was along the NW-SE as wells.

Keywords

References

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Advanced Applied Geology
Volume 12, Issue 2
July 2022
Pages 276-290

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