The complete owner's guide to the Conroe Oilfield — Montgomery County, Texas — geology, the 1931 Strake discovery, the salt-dome trap, and 95+ years of continuous production.
Quick answer
The Conroe Oilfield is one of the major Texas Gulf Coast salt-dome oilfields. Discovered in December 1931 by George W. Strake's South Texas Development Company, the field became one of the largest U.S. oil discoveries of its decade. Cumulative production exceeds 700 million barrels of oil from a single Eocene-age formation, the Cockfield, at depths of approximately 5,000-5,300 ft TVD.
The field is contained within Montgomery County, Texas — immediately north of Houston — and underlies portions of the modern city of Conroe. The county's oil-driven economic development through the 1930s-1950s built much of the modern infrastructure that has since been overlaid by Houston-suburb residential expansion.
The Conroe Oilfield is a textbook Texas Gulf Coast salt-dome trap:
Producing formation: Eocene-age Cockfield Sandstone
Depth: approximately 5,000-5,300 ft TVD
Trap mechanism: faulted anticline associated with the Conroe salt dome's vertical movement; multiple stacked sandstone reservoirs at different depths within the structure
Reservoir quality: high porosity (20-30%), good permeability; the original wells produced at very high natural rates
Cumulative production: more than 717 million barrels of oil by January 1, 1993 (Texas State Historical Association)
1932-1933: Flush production — primary recovery came from a strong water drive and gas-cap expansion; on August 10, 1933, with the field only partly developed, production reached a peak daily flow of about 92,000 barrels of oil
From April 1933: Pressure maintenance — reservoir pressure has been closely observed since April 1933 and maintained by gas and water injection, which the Texas State Historical Association says obviated the need for secondary recovery
1978: Unitized — the field was unitized in 1978, keeping its twenty-acre spacing; it had produced more than 717 million barrels of oil by January 1, 1993
The Conroe discovery in December 1931 came fourteen months after the East Texas Oilfield discovery (October 1930) — together they were the two largest U.S. oil discoveries of the early Depression era. The Conroe field's high-rate early production added to the East Texas oversupply problem and contributed to the 1931-1933 oil-price collapse that drove the modern Texas Railroad Commission pro-rationing system.
For modern mineral owners, the Conroe field's 95+ years of continuous production has created a long-tail royalty income stream that has passed through multiple generations of family ownership.
Modern Conroe operators are predominantly long-tenured private waterflood operators. For full operator detail see Conroe Oil Unit Operators List.
Out-of-state owners are common — many Conroe interests are inherited 4-5 generations deep:
California owners with Conroe interests
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