---
title: "Subsurface Petrophysics Saturation"
method: GET
path: "/api/v1/subsurface/petrophysics/saturation"
tags: ["Subsurface Imaging"]
---

# Subsurface Petrophysics Saturation

`GET /api/v1/subsurface/petrophysics/saturation`

## Request

- Base URL: `https://www.deepmapai.com`
- URL: `https://www.deepmapai.com/api/v1/subsurface/petrophysics/saturation`
- Auth: none declared

Convert resistivity to water saturation using Archie's Law.

Estimates water saturation from bulk resistivity, porosity,
and formation water resistivity using the Archie (1942)
equation.

Parameters
----------
resistivity_ohm_m : float
    Bulk rock resistivity in ohm-m.
porosity : float
    Rock porosity (0 to 1).
water_resistivity_ohm_m : float
    Formation water resistivity in ohm-m (default 0.05).

**Pricing:** Included in subscription tiers (legacy list price: GET /api/v1/billing/pricing).

## Query parameters

- `resistivity_ohm_m` number, required: Bulk resistivity in ohm-m
- `porosity` number, required: Porosity (0-1)
- `water_resistivity_ohm_m` number: Formation water resistivity in ohm-m (default 0.05)
- `x_api_key` string, nullable

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/deepmapai/apis/deepmap-ai.md) · [All operations](https://skmtc.dev/deepmapai/apis/deepmap-ai/llms.txt) · [OpenAPI document](https://skmtc.dev/deepmapai/apis/deepmap-ai/revisions/dab995d977d0?raw)