Taphonomic Pathways for the Formation of Bioturbated Cycles in the Early Cretaceous Wave-Dominated Deltaic Environment: Ghuneri Member, Kachchh Basin, India

Desai, Bhawanisingh G.; Chauhan, Suruchi

doi:10.1007/978-3-030-71370-6_11

Cited by 4 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The studied Bhuj Formation belongs to the Cretaceous Age deposits of marine to deltaic depositional environment. The Bhuj Formation is divided into Ghuneri, Ukra and Upper members (Biswas 2016;Desai and Saklani, 2012;Desai and Chauhan, 2021). The Ghuneri member is characterized by highly bioturbated; ferruginous, medium-to coarse-grained cross-bedded sandstones, alternating with ferruginous, micaceous, laminated, fine-grained sandstone with minor shales (Desai and Saklani, 2012;Desai and Chauhan, 2021).…”

Section: Geology Of the Studied Areamentioning

confidence: 99%

Evaluating cementation factor for bioturbated sandstones, Bhuj Formation, Kachchh Basin, India: a novel approach using triple-porosity model

Singh

Dcunha

Desai

2022

J Petrol Explor Prod Technol

Self Cite

View full text Add to dashboard Cite

Cementation factor has a crucial role in evaluating volumetric reserves for heterogeneous clastic reservoir. Bioturbation is a prominent source of heterogeneity existing in hydrocarbon-bearing formation across the world. The effect of bioturbation on the petrophysical properties of the clastic has not been comprehensively understood yet, especially its effect on cementation factor estimation. The precise description of such properties is beneficial in developing better volumetric estimates and optimizing field development planning. The present work discusses an approach to characterize cementation factor in bioturbated clastic Bhuj Formation, Kachchh Basin, India. In order to ascertain the cementation exponent for bioturbated media, an improved triple-porosity model is proposed by quantifying the total porous volume into three components, namely matrix 1, matrix 2 and bioturbated region. An equivalent resistance model is then developed by identifying the series and parallel relation between the two matrix components and the burrow. The experimental observations of electrical response indicated large variation in resistivity in vertical cores compared to horizontal cores. The decreased resistivity is due to the vertically aligned burrow which due to their enhanced porosity provides less tortuous path for current to flow. The triple-porosity model is validated with different porosity value of matrix 1, matrix 2 and burrow, and a cementation factor of 2.8 for higher bioturbated samples and 3 for lower bioturbated samples is obtained. This validates the previous understanding of enhanced flow and storage property and thereby produces a consistent way to evaluate total cementation factor. The correct estimation of cementation factor helps in precise evaluation of water saturation in bioturbated reservoirs.

show abstract