Material Source Analysis of Daning−Jixian Exploration Area and Its Adjacent Shan–2 Member in the Eastern Margin of Ordos Basin
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摘要:
鄂尔多斯盆地东缘山西组山2段具备优质的源储配置条件，是区域油气勘探的重要储集层位。结合露头古流向、重矿物及碎屑锆石测年数据，对大宁−吉县区块进行山2段物源分析，认为山2段沉积期大宁−吉县区块为南、北双物源共同控制，主要证据有3方面：①大宁−吉县东部露头区2段砂岩古流向发生显著变化，北部临汾市管头镇为由北向南的古流向，南部台头镇却为由南向北的古流向特征。②大宁−吉县油气探区山2亚段砂岩重矿物差异显著，以二郎山旅游区附近为界，超稳定重矿物锆石以及稳定重矿物白钛矿发生了显著的南北分异。③大宁−吉县探区内锆石样品测年峰值南北表现不统一，北部砂岩锆石测年表现为1 800 ～2 000 Ma和2 400 ～2 500 Ma 2个年龄峰值，南部砂岩锆石年龄峰值表现为300～700 Ma、1100～1 200 Ma、1 800～2 000 Ma和2 400～2 600 Ma等4个峰值。该认识不仅为大宁−吉县油气探区砂体展布刻画提供指导性线索的同时，也将为区域山2段沉积期古地理背景研究提供重要证据。
Abstract:The Shan–2 member of Shanxi Formation in the eastern margin of Ordos basin has excellent source reservoir allocation conditions, and is an important reservoir for regional oil and gas exploration. Based on the outcrop paleocurrent, heavy minerals and clastic zircon dating data, the provenance analysis of Shan–2 member in Daning−Jixian exploration area is carried out, and it is considered that the Daning−Jixian oil and gas exploration area in Shan–2 member sedimentary period is jointly controlled by the south and north provenances. The main evidence is as follows. ① There has been a significant change in the ancient flow direction of sandstone in the outcrop area of the eastern part of Daning−Jixian. Guantou Town, Linfen City, in the north, is characterized by a north to south ancient flow direction, while Taitou Town, in the south, is characterized by a south to north ancient flow direction. ② There is a significant difference in the heavy minerals of sandstone in the Shan–2 sub section of the Daning−Jixian oil and gas exploration area. Taking the vicinity of the Erlang mountain tourist area as a boundary, there is a significant north−south differentiation in the ultra stable heavy mineral zircon and stable heavy mineral perovskite. ③ The peak ages of zircon samples in the Daning–Jixian exploration area are not uniform in the north and south. The zircon ages of sandstone in the north show two peak ages (1 800～2 000 Ma, 2 400～2 500 Ma ), while the zircon ages of sandstone in the south show four peak ages (300～700 Ma, 1 100～1 200 Ma, 1 800～2 000 Ma, 2 400～2 600 Ma). This understanding will not only provide guiding clues for the distribution and characterization of sand bodies in Daning−Jixian oil and gas exploration area, but also provide important evidence for the study of the paleogeographic background of the sedimentary period of Shan2 member.
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Key words:
- Ordos basin /
- Shanxi Formation /
- material source /
- heavy minerals /
- detrital zircon dating
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表 1 大宁–吉县区块山2段重矿物含量对比表
Table 1. Comparison of heavy mineral content in Shan–2 section of Daning–Jixian block
地层 样品号 陆源重矿物含量占比（%） 自生重矿物（%） 锆石 电气石 石榴子石 磷灰石 磁铁矿 赤褐铁矿 白钛矿 绿帘石 黝帘石 榍石 金红石 锡石 锐钛矿 板钛矿 云母 绿泥石 菱铁矿 硬石膏 重晶石 黄铁矿 山2 JT2-3 35.2 13.8 32.2 9.6 8.8 山2 JT4-2 0.9 0.9 0.5 0.3 0.1 山2 DJ20-9 5.1 0.5 1.4 1.4 6.5 0.4 0.9 0.4 0.5 82.9 8.8 8.1 山2 DJ38-1 90.0 山2 G4-1 37.4 1.0 3.6 2.1 32.8 0.5 0.5 4.6 2.1 15.4 3.6 0.5 7.7 山2 H15-61 42.4 1.1 1.1 0.4 42.8 0.8 4.9 0.4 6.1 1.9 0.4 山2 DJ45-2 38.5 1.8 36.7 0.9 9.2 2.8 10.1 44.0 3.8 山2 DJ19-24 10.6 1.1 1.1 0.6 86.7 1.1 0.6 山2 JT2-8 3.4 3.9 0.1 4.2 1.5 1.6 山2 JT4-3 3.1 3.5 0.4 8.5 0.8 0.5 山2 G3-2 8.0 1.2 88.3 0.6 1.9 1.0 14.5 1.0 2.5 山2 DJ30-9 43.2 2.0 3.2 0.4 40.0 0.4 3.6 7.2 3.1 1.1 山2 DJ35-15 5.1 4.1 3.1 25.5 19.4 1.0 41.8 15.5 42.5 山2 DJ31-1 2.6 1.3 3.8 8.3 0.6 83.3 15.1 1.1 山2 G2-1 42.7 4.4 3.1 0.9 42.7 0.9 0.4 1.3 0.4 0.4 2.7 5.3 2.5 山2 G5-7 95.0 山2 G8-1 95.0 48.0 3.5 山2 DJ10-3 1.5 2.9 1.5 92.6 1.5 16.2 37.8 山2 G7-3 31.8 8.4 3.4 1.1 43.6 1.1 3.4 0.6 6.7 50.7 0.5 0.5 山2 H12-1 5.2 6.3 0.6 86.2 0.6 0.6 0.6 31.3 0.8 山2 H4-3 33.3 7.4 2.1 23.8 8.5 0.5 24.3 8.8 7.9 山2 H5-1 39.9 5.5 28.8 5.5 15.3 4.3 0.6 31.0 0.6 0.6 山2 DJ53-8 3.9 1.7 1.7 1.7 1.1 89.9 20.4 2.1 3.3 山2 DJ51-4 19.8 2.5 33.3 1.2 24.7 7.4 1.2 9.9 55.1 11.5 
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