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Heterogeneity Genesis of Bioclastic Limestone Reservoirs of Cretaceous Mishrif Formation in M Oilfield, Iraq(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第03期
Page:
297-312
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Heterogeneity Genesis of Bioclastic Limestone Reservoirs of Cretaceous Mishrif Formation in M Oilfield, Iraq
Author(s):
LI Feng-feng1;  GUO Rui1;  LIU Li-feng1;  SONG Shi-qi2
(1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China; 2. College of Geosciences, China University of Petroleum, Beijing 102249, China)
Keywords:
Mishrif Formation;  bioclastic limestone;  heterogeneity;  sedimentation;  bioturbation;  diagenesis;  sea level cycle;  Iraq
PACS:
P618.130.1; TE122
DOI:
10.19814/j.jese.2019.09011
Abstract:
The bioclastic limestone of Cretaceous Mishrif Formation in M oilfield, Iraq, has strong heterogeneity, and the problem in the process of development is serious. Based on the core observation, cast thin section and experiment data, the heterogeneity genesis was analyzed. The results show that the reservoirs of Mishrif Formation in M oilfield are mainly controlled by sedimentation, bioturbation, diagenesis, and sea level cycles. Sedimentation controls the structural components and original physical properties of rocks, and affects the subsequent diagenetic evolution; bioturbation transforms the rock structure, causes the structure to loosen, and provides seepage channels for diagenetic fluids; diagenesis controls the transformation trend of rocks physical property; sea level cycles cause the change of sediment facies, and control the marine diagenetic environment and meteoric freshwater diagenetic environment. The rocks developed in high-energy sedimentary environment have high content of grain fraction, and the original physical properties are good. During the sea level decline, the upper part of the shoal is preferentially leached, while the lower part is strongly cemented, and the reservoir physical properties are polarized, thus high-quality reservoirs are usually associated with physical interlayers. The rocks developed in low-energy sedimentary environment have high content of argillaceous and poor physical properties. However, the bioturbation is widely developed, the physical properties of the burrow are usually higher than that of the substrate. The sea level decline causes the rocks to be in the meteoric freshwater diagenetic environment, and the dissolute fluid can infiltrate the burrows and effectively improve the physical properties. The Mishrif Formation has multiple stages of sea level cycles, the sedimentary environment evolves rapidly, the diagenetic environment changes continuously, the distribution of biological burrow is random, and reservoirs with different genesis are stacked each other, which result in strong vertical heterogeneity of thick bioclastic limestone reservoirs.

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Last Update: 2020-05-27