COMPOSITION AND STABLE-ISOTOPE GEOCHEMISTRY OF NATURAL GASES FROM KANSAS, MIDCONTINENT, USA
COMPOSITION AND STABLE-ISOTOPE GEOCHEMISTRY OF NATURAL GASES FROM KANSAS, MIDCONTINENT, USA
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DOI：
10.1016/0009-2541(88)90110-6
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发表时间：
1988-12-15
期刊：
影响因子：
3.9
通讯作者：
WATNEY, WL
中科院分区：
文献类型：
--
作者：
JENDEN, PD;NEWELL, KD;WATNEY, WL
在美国的堪萨斯，已经生产了超过28·1012英尺3（79·1010立方米）的天然气和5.3·109桶（8.4·108立方米）的石油，来自阿纳达科盆地北方构造隆起和浅海湾的古生代碳酸盐岩和砂岩储层。堪萨斯是一个勘探程度高、地质特征鲜明的州，是研究油气运移和测试天然气成因地球化学模型的绝佳场所。堪萨斯东部（切罗基和森林城盆地）未成熟至边缘成熟的岩石产生混合的微生物和热成因气体。该地区的气体湿度为0.03- 51%，甲烷δ 13 C = −65至−43‰，甲烷δD = −260至−150‰。来自堪萨斯中部和西部（内马哈隆起到雨果顿海湾）的天然气完全是热成因的，湿度=4- 51%，甲烷δ 13 C = −48至−39‰，甲烷δD = −195至−140‰。整个堪萨斯的乙烷和丙烷δ 13 C值分别在−38至−28‰和−35至−24‰之间变化。成熟的热成因气（产自堪萨斯西南部和阿纳达科盆地的烃源岩，Ro≤ 1.4%）在全州范围内得到确认。在堪萨斯中部和北方内马哈隆起以及切罗基盆地，侧向运移进入浅层储层可能发生在沿着基底宾夕法尼亚砾岩和区域次宾夕法尼亚不整合面风化的下古生代碳酸盐岩上。早期热成因气（由Ro ≤ 0.7%的当地烃源岩生成）在Salina和Forest City盆地的孤立油气田、切罗基盆地的次Pennsylvania不整合面之下的奥陶系储层以及切罗基和Sedgwick盆地、堪萨斯隆起东部中部和Hugoton海湾不整合面之上的储层中得到确认。
More than 28·1012ft.3(79·1010m3) of natural gas and 5.3·109bbl (8.4·108m3) of oil have been produced in Kansas, U.S.A., from Paleozoic carbonate and sandstone reservoirs on structural uplifts and shallow embayments along the northern margin of the Anadarko basin. A heavily-explored, geologically well-characterized state, Kansas is an excellent place to study hydrocarbon migration and to test geochemical models for the origin of natural gases.Immature to marginally-mature rocks of eastern Kansas (Cherokee and Forest City basins) produce mixed microbial and thermogenic gases. Gases in this region have wetness = 0.03–51%, methaneδ13C = −65 to −43‰ and methaneδD = −260 to −150‰. Gases from central and western Kansas (Nemaha uplift to Hugoton embayment) are entirely thermogenic and have wetness =4–51%, methaneδ13C = −48 to −39‰ and methaneδD = −195 to −140‰. Ethane and propaneδ13C-values throughout Kansas vary from −38 to −28‰ and from −35 to −24‰, respectively.Mature thermogenic gas (generated from source rocks in southwestern Kansas and the Anadarko basin with 1.0% ≤Ro≤ 1.4%) is recognized throughout the state. Lateral migration into shallow reservoirs on the Central Kansas and northern Nemaha uplifts and in the Cherokee basin probably occurred along basal Pennsylvanian conglomerates and weathered Lower Paleozoic carbonates at the regional sub-Pennsylvanian unconformity. Early thermogenic gas (generated by local source rocks withRo≤ 0.7%) is recognized in isolated fields in the Salina and Forest City basins, in Ordovician reservoirs beneath the sub-Pennsylvanian unconformity in the Cherokee basin, and in reservoirs generally above the unconformity in the Cherokee and Sedgwick basins, the eastern Central Kansas uplift and the Hugoton embayment.