The Tomball Field lies beneath and around the city of Tomball in northwest Harris County. Oil was discovered on May 27, 1933, on land owned by J. F. W. Kob, and within months the settlement had gone from a farming community of a few hundred people to a place that called itself Oil Town U.S.A. The field produced from Eocene Cockfield and Yegua sands and made Tomball one of the more unusual company towns in Texas — including a 1935 agreement that gave residents free natural gas and water for ninety years.
Source: Texas Railroad Commission production filings, aggregated across RRC field designations 90620001, 90620184, 90620299, 90620560, 90620667, 90620782. Reported volumes lag the calendar by several months.
The discovery came on May 27, 1933, west of Tomball on the Kob property, in the middle of the Depression and only two years after the East Texas field had upended the industry. The response was immediate: within a short time twenty-five to thirty oil and gas companies were operating within a five-mile radius, and the town’s population tripled from roughly 665 in July 1933 to an estimated two thousand or more within months.
Humble Oil and Refining became the dominant operator and built the infrastructure of a company town around the field — worker housing, camps and recreational facilities. In 1935 the city negotiated an agreement that has been quoted in Texas history ever since: free water and natural gas for Tomball residents for ninety years in exchange for drilling rights within the city limits. The arrangement was unusual enough to be featured in Ripley’s Believe It or Not.
Tomball’s oil field aged as most Gulf Coast sand fields do, with production declining gradually over the following decades while the town itself grew into the Houston metropolitan area. Development has since surrounded and in places covered the old field. Mineral ownership beneath a growing suburb creates its own complications, since surface and mineral estates in Harris County were severed generations ago and many surface owners today have no idea who holds the minerals under them.
Tomball produces from Eocene Cockfield and Yegua sandstones, part of the thick deltaic and shoreline section that underlies the upper Texas Gulf Coast. The sands are stacked, moderately porous and trapped by a combination of faulting and stratigraphic pinch-out rather than by a piercement salt dome. That distinguishes Tomball from the caprock fields of the Spindletop era to the east: this was a deeper, more conventional sandstone accumulation, found by systematic exploration rather than by drilling an obvious surface feature.
Tomball was developed primarily under natural drive rather than through large-scale injection projects, and it has never been the site of a major flood or gas-cycling scheme comparable to the big Permian or coastal EOR fields. Additional recovery has come from recompletion between sands, workovers, and infill drilling in the more productive parts of the structure. As surface development spread over the field, the practical constraints on drilling and workovers changed as well, which affects how aggressively remaining reserves can be pursued.
Tomball interests are conventional Gulf Coast royalties: modest, comparatively steady, and long-lived compared with the steep front-loaded decline of a horizontal shale well. The complicating factor here is urbanization. Minerals under a developed suburb are still real property, still severable and still saleable, but development history, surface use and old severances can make title work more involved than in rural counties. We buy minerals and royalties in Harris County and provide free written offers.
County-level well data, production charts, and selling guides for the counties this field spans:
Often not. Mineral estates across Harris County were severed from the surface long ago, frequently before the modern subdivisions were platted. Owning a home or lot does not mean owning what is beneath it. A title search or a review of your deed will show whether any mineral interest was conveyed to you or reserved by a prior owner.
Production from the old field is much reduced from its 1930s peak and much of the area has been developed at the surface. Some production continues in the broader area. Whether your specific tract has active wells or a producing lease is a question your check detail or a Railroad Commission search can answer.
Yes. Non-producing minerals are routinely bought and sold, and they carry value based on the likelihood of future leasing and drilling rather than on current income. Values are lower than for producing interests, and honest buyers say so up front. We will tell you plainly what a non-producing Harris County interest is worth to us.