Methods and systems for estimation of formation fluid properties

A method for predicting a fluid property, the method comprising:

• obtaining, using a logging system, a well log of a well, wherein the well log comprises well log data at each of a plurality of depths within the well;
• obtaining, using a fluid retrieval system, a first fluid sample at a first one of the plurality of depths within the well;
• obtaining, using the fluid retrieval system, a second fluid sample at a second one of the plurality of depths within the well;
• determining a first fluid property from the first fluid sample;
• determining a second fluid property from the second fluid sample;
• determining a transform based on the first fluid property, the second fluid property, and the well log data at both the first one of the plurality of depths and the second one of the plurality of depths;
• applying the transform to the well log data at a third location yielding a first predicted fluid property,
• wherein the third location comprises a third one of the plurality of depths within the well;
• determining a subsurface development plan based on the first predicted fluid property;
• obtaining, using a seismic data acquisition system, seismic data from a geographical region that includes the well;
• determining, using a subsurface processing system, a velocity model based on the seismic data at a fourth location, wherein the fourth location is a distance from the well within a formation;
• applying the transform to the velocity model yielding a second predicted fluid property at the fourth location;
• determining, using a fluid property analysis system, a reservoir fluid window based on the first predicted fluid property and the second predicted fluid property,
• wherein the reservoir fluid window comprises an oil window and a gas window;
• designing, using a well planning system, a borehole drilling plan based on the reservoir fluid window;
• and
• drilling, using a drilling system, a borehole based on the borehole drilling plan.

A system for estimating a fluid property, the system comprising:

• a logging system comprising a logging tool configured to obtain a well log of a well,
• wherein the well log comprises well log data at each of a plurality of depths within the well;
• a fluid retrieval system configured to obtain a first fluid sample at a first one of the plurality of depths and a second fluid sample at a second one of the plurality of depths;
• a fluid property analysis system configured to:
• determine a first fluid property from the first fluid sample,
• determine a second fluid property from the second fluid sample,
• determine a transform based on the first fluid property, the second fluid property, and the well log data at both the first one of the plurality of depths and the second one of the plurality of depths, and
• apply the transform to the well log data at a third one of the plurality of depths within the well yielding a first predicted fluid property;
• and
• a subsurface development planning system configured to determine a subsurface development plan based on the first predicted fluid property.