Sales volumes decreased by 477,224 Boe (5,187 Boe/d) to 773,920 Boe (8,412 Boe/d) for the three months ended September 30, 2020 compared to 1,251,144 Boe (13,599 Boe/d) for the same prior year period. Sales volumes decreased by 1,085,045 Boe (4,008 Boe/d) to 2,538,007 Boe (9,263 Boe/d) for the nine months ended September 30, 2020 compared to 3,623,052 Boe (13,271 Boe/d) for the same prior year period. The lower volumes in both 2020 periods are primarily due to more wells coming onto production in late 2018 and early 2019 (11.0 new wells coming online in the fourth quarter of 2018 and 20.0 new operated wells in the first nine months of 2019) compared to late 2019 and the first half of 2020 (2.0 wells coming online in each of the fourth quarter of 2019 and first quarter of 2020 and 4.0 net wells that came online in late second quarter 2020). This scaled back 2020 development plan is in a large part due to the decrease in oil prices beginning in early March 2020 and reflects capital spending limitations included in our recent credit agreement amendments. The three months and nine months ended September 30, 2019 also included approximately 1,074 Boe/d and 1,158 Boe/d of production from the Dimmit County assets, which were sold in October 2019.
Our sales volume is oil‐weighted, with oil representing 61% and 64% of total sales volume for the three and nine months ended September 30, 2020, respectively, and liquids (oil and NGLs) representing 81% of total sales volumes for the three and nine months ended September 30, 2020. For the three and nine months ended September 30, 2019, oil represented 64% and 63% of total sales volumes, respectively, and liquids represented 80% and 79% of total sales volumes, respectively. Our oil cut decreased slightly during the three months ended September 30, 2020 due primarily to a decrease in flared natural gas volumes and restored production on certain of our gassier wells.
Oil sales. Oil sales decreased by $28.1 million (62%) to $17.6 million for the three months ended September 30, 2020 from $45.7 million for the same prior year period. The decrease in oil revenue was driven by lower sales volumes ($18.5 million) and the significant decrease in market prices beginning in March 2020 ($9.5 million). Oil sales volumes decreased 41% to 474,806 Bbls for the three months ended September 30, 2020 compared to 798,256 Bbls for the prior year period. The average realized price on the sale of our oil decreased by 32% to $37.15 per Bbl for the three months ended September 30, 2020.
Oil sales decreased by $74.8 million (56%) to $57.8 million for the nine months ended September 30, 2020 from $132.6 million for the same prior year period, of which $37.4 million was the result of lower realized oil prices and $37.4 million was the result of lower sales volumes. The average realized price on the sale of our oil decreased by 39% to $35.56 per Bbl for the nine months ended September 30, 2020. Oil sales volumes decreased 28% to 1,626,558 Bbls for the nine months ended September 30, 2020 compared to 2,265,781 Bbls for the prior year period.
Natural gas sales. Natural gas sales decreased by $1.1 million (38%) to $1.7 million for the three months ended September 30, 2020 from $2.8 million for the prior year period. The decrease in natural gas revenues was driven by lower sales volumes ($1.2 million), offset by a slight improvement in pricing. Natural gas sales volumes decreased 43% to 870,956 Mcf for the three months ended September 30, 2020 compared to 1,537,676 Mcf for the prior year period. As noted above, we sold our Dimmit County assets in October 2019, which accounted for approximately 15% of our gas production for the three months ended September 30, 2019 (but only 3% of our oil production). The average realized price on the sale of our natural gas increased by 9% to $2.00 per Mcf (net of certain transportation and marketing costs) for the three months ended September 30, 2020 from $1.84 per Mcf for the prior year period.
Natural gas sales decreased by $4.5 million (47%) to $5.1 million for the nine months ended September 30, 2020 from $9.6 million for the prior year period, of which $3.4 million was the result of lower production volume and $1.1 million was the result of lower product pricing. Natural gas sales volumes decreased 35% to 2,909,449 Mcf for the nine months ended September 30, 2020 compared to 4,498,227 Mcf for the prior year period. The average realized price on the sale of our natural gas decreased by 18% to $1.76 per Mcf for the nine months ended September 30, 2020 from $2.14 per Mcf for the prior year period.
NGL sales. NGL sales decreased by $1.0 million (40%) to $1.5 million for the three months ended September 30, 2020 from $2.6 million for the prior year period. The decrease in NGL revenues was the result of lower sales volumes ($0.6 million) and lower product pricing ($0.5 million). NGL sales volumes decreased 42,654 Bbls (22%) to 153,955 Bbls for the three months ended September 30, 2020 compared to 196,609 Bbls for the prior year period. The average realized price on the sale of our NGLs decreased by 24% to $10.02 per Bbl for the three months ended September 30, 2020 from $13.18 per Bbl for the prior year period.