| 140501 | ZSCHECH UNIT | Lee County, TX | Oil & Gas Property | Jan 2026 |
| 140502 | ZUBER | Jack County, TX | Oil & Gas Property | Feb 2026 |
| 140503 | ZUCINNI CS FED | Campbell County, WY | Gas Property | Feb 2012 |
| 140504 | ZUCK S.V. STATE A2796 | Webb County, TX | Oil & Gas Property | Feb 2026 |
| 140505 | ZUCKERMAN | San Joaquin County, CA | Gas Property | Mar 1990 |
| 140506 | ZUEB | Gray County, TX | Oil & Gas Property | Feb 2026 |
| 140507 | ZUEGE | Yuma County, CO | Gas Property | Feb 2026 |
| 140508 | ZUEHLKE UNIT | Fayette County, TX | Oil & Gas Property | Feb 2026 |
| 140509 | ZUERCHER | Edwards County, KS | Oil & Gas Property | Jan 2026 |
| 140510 | ZUERCHER | Edwards County, KS | Oil & Gas Property | Jan 2026 |
| 140511 | ZUGG | Pawnee County, KS | Oil & Gas Property | Jan 2026 |
| 140512 | ZUIDERVEEN | Missaukee County, MI | Oil & Gas Property | Jan 2026 |
| 140513 | ZULA 1 | Howard County, TX | Oil & Gas Property | Jan 2026 |
| 140514 | ZULA 18 | Roger Mills County, OK | Oil & Gas Property | Jan 2026 |
| 140515 | ZULCH, SALLY | Madison County, TX | Oil & Gas Property | Jan 2026 |
| 140516 | ZULETTE | Reagan County, TX | Oil & Gas Property | Jan 2026 |
| 140517 | ZULU | Mountrail County, ND | Oil & Gas Property | Mar 2026 |
| 140518 | ZUM 28-13-7 | Canadian County, OK | Oil & Gas Property | Feb 2026 |
| 140519 | ZUM MALLEN | Canadian County, OK | Oil & Gas Property | Feb 2021 |
| 140520 | ZUM MALLEN 1307 | Canadian County, OK | Oil & Gas Property | Jan 2026 |
| 140521 | ZUMA 3 | Loving County, TX | Oil & Gas Property | Feb 2026 |
| 140522 | ZUMA 57-T1-3X10 | Loving County, TX | Oil & Gas Property | Feb 2026 |
| 140523 | ZUMBACH UNIT | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 140524 | ZUMBRO | Franklin County, MS | Oil & Gas Property | Jul 2021 |
| 140525 | ZUMMALLEN | Kingfisher County, OK | Oil & Gas Property | Jan 2026 |
| 140526 | ZUMPETTA, LAWRENCE ET AL ZMBG | Wetzel County, WV | Oil & Gas Property | Dec 2021 |
| 140527 | ZUMWALT | Colusa County, CA | Gas Property | Mar 2026 |
| 140528 | ZUMWALT | Stephens County, OK | Oil & Gas Property | Jan 2026 |
| 140529 | ZUMWALT | Colusa County, CA | Gas Property | Jul 2005 |
| 140530 | ZUMWALT | Colusa County, CA | Gas Property | Jun 1988 |
| 140531 | ZUMWALT | Glenn County, CA | Gas Property | Sep 2009 |
| 140532 | ZUPSIC | Allegheny County, PA | Gas Property | Dec 2025 |
| 140533 | ZURBRUGG | Columbiana County, OH | Oil & Gas Property | Dec 2024 |
| 140534 | ZURICH | Seminole County, OK | Oil & Gas Property | Jan 2026 |
| 140535 | ZURICH TOWNSITE | Rooks County, KS | Oil Property | Aug 1999 |
| 140536 | ZUTZ 5693 44-12T | Mountrail County, ND | Oil & Gas Property | Mar 2026 |
| 140537 | ZVOLANEK | Ellsworth County, KS | Oil Property | Jan 2026 |
| 140538 | ZWAHLEN | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 140539 | ZWEIG | Gray County, TX | Gas Property | Apr 2004 |
| 140540 | ZWENKE 34-11H | Dunn County, ND | Oil & Gas Property | Mar 2026 |
| 140541 | ZWERNEMANN | Jim Wells County, TX | Oil & Gas Property | Sep 2025 |
| 140542 | ZWEYGARDT | Cheyenne County, KS | Oil & Gas Property | Jan 2026 |
| 140543 | ZWEYGARDT | Cheyenne County, KS | Gas Property | Jan 2026 |
| 140544 | ZWEYGARDT | Cheyenne County, KS | Gas Property | Jan 2026 |
| 140545 | ZWICK | Rice County, KS | Oil Property | Jan 2026 |
| 140546 | ZWILLICH | Ellsworth County, KS | Oil Property | Jan 2026 |
| 140547 | ZWIRN | Yuma County, CO | Gas Property | Feb 2026 |
| 140548 | ZWIRN | Yuma County, CO | Gas Property | Feb 2026 |
| 140549 | ZYBACH | Wheeler County, TX | Oil & Gas Property | Feb 2026 |
| 140550 | ZYBACH | Wheeler County, TX | Oil & Gas Property | Feb 2026 |
| 140551 | ZYBACH 6 | Wheeler County, TX | Oil & Gas Property | Feb 2025 |
| 140552 | ZYBACH-T | Wheeler County, TX | Oil & Gas Property | Feb 2026 |
| 140553 | ZYSK FEDERAL 1-A | Campbell County, WY | Oil & Gas Property | Mar 2026 |
| 140554 | [14744] CASTLE BLACK 6 1 B2CD FEDERAL CO | Lea County, NM | Oil & Gas Property | Feb 2026 |
| 140555 | `IDEWATER OIL CO. FEE | Liberty County, TX | Oil & Gas Property | Jul 2025 |