鄂尔多斯盆地奥陶系马家沟组四段构造- 岩相古地理新认识及勘探意义
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本文为中国石油天然气股份有限公司科技重大项目“海相碳酸盐岩有效储层形成与保持机理及分布预测研究”(编号 2021DJ0503)、长庆油田公司重大科技专项“鄂尔多斯盆地中元古界- 奥陶系构造沉积演化、成源机制与勘探新领域研究”(编号 ZDZX2021)资助的成果


Tectonic paleogeographic framework of the fourth Member of Ordovician Majiagou Formation in Ordos basin and its significance for oil and gas exploration
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    摘要:

    米探1井取得天然气勘探突破表明鄂尔多斯盆地奥陶系马家沟组四段具有巨大勘探潜力,然而,对盆地奥陶纪马四期古构造格局和岩相古地理研究还存在争议,制约了下步天然气勘探进程。为此,基于地震、野外露头、钻井、岩芯、微观薄片和测井等基础资料,对马家沟组四段构造- 岩相古地理开展了系统研究,确定了盆地奥陶纪马四期古构造格局,并恢复出马家沟组四段岩相古地理,预测了有利勘探区。研究结果表明:① 鄂尔多斯盆地奥陶纪马四期发育“两陆三隆四坳”的古构造格局,其中两陆为伊盟古陆和阿拉善古陆,三隆分别为中央古隆起、中条古隆起和神木- 志丹低隆起,四坳为西南边缘坳陷、桃利庙坳陷、府谷坳陷和柳林坳陷;② 马四期为碳酸盐岩内缓坡和中缓坡沉积,其中内缓坡又发育白云岩坪、含云膏坪、微生物丘、灰泥丘、砂屑滩、丘滩间海和灰质潟湖等7类微相;③ 古构造格局控制马家沟组四段沉积分异,微生物丘、灰泥丘和砂屑滩等3类有利储集相主要沿中央古隆起和神木- 志丹低隆起等古地貌高部位分布。因此认为,神木—靖边地区是有利储层发育区,且处于岩性相变带,生储盖配置关系好,具有良好的成藏条件,是天然气勘探的有利靶向区。

    Abstract:

    The breakthrough in natural gas exploration of well Mitan 1 indicates that the 4th Member of Ordovician Majiagou Formation in Ordos basin has great exploration potential. However, there are still disputes regarding the paleotectonic framework and lithofacies palaeogeography of the 4th Member of Ordovician Majiagou Formation in Ordos basin, which restricts the next stage of natural gas exploration process. Therefore, based on basic data such as earthquakes, field outcrops, drilling, cores, micro thin sections and logging, a systematic study was carried out on the structural lithofacies palaeogeography of the 4th Member of the Majiagou Formation, and the Ordovician paleostructural pattern of the 4th Member of the Majiagou Formation in Ordos basin was determined, the lithofacies palaeogeography of the 4th Member of the Majiagou Formation was recovered, and the favorable exploration area was predicted. The results show that: ① the paleotectonic framework of “two continents, three uplifts and four depressions” was developed in the 4th stage of Ordovician in Ordos basin. The two continents are the Yimeng ancient land and the Alxa ancient land, the three uplifts are the Central ancient uplift, the Zhongtiao ancient uplift, and the Shenmu- Zhidan low uplift, respectively. The four depressions are the Southwest edge depression, the Taolimiao depression, the Fugu depression, and the Liulin depression. ② The 4th stage of Ordovician was composed of carbonate rock inner gentle slope and middle gentle slope deposits, in which the inner gentle slope developed 7 microfacies, including dolomite flat, cloud bearing plaster, sand debris beach, microbial hill, lime mud hill, beach/hill sea and lime lagoon. ③ The paleotectonic framework controls the sedimentary differentiation of the 4th Member of the Majiagou Formation. Three favorable reservoir facies, including sand debris beach, microbial mound and lime mud mound, are mainly distributed along the middle bulge of the southwest margin depression and the high part of the ancient landform, such as Shenmu- Zhidan low uplift. The conclusion is that Shenmu- Zhidan area is a favorable reservoir development area, and is located in the lithologic phase change zone, with good source reservoir cap configuration and favorable reservoir forming conditions. It is a favorable target area for the next step of natural gas exploration.

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于洲,王维斌,魏柳斌,李辉,吴东旭,乔占峰,吴兴宁,鲁慧丽,刘雨昕,胡文中.2023.鄂尔多斯盆地奥陶系马家沟组四段构造- 岩相古地理新认识及勘探意义[J].地质学报,97(8):2645-2658.
YU Zhou, WANG Weibin, WEI Liubin, LI Hui, WU Dongxu, QIAO Zhanfeng, WU Xingning, LU Huili, LIU Yuxin, HU Wenzhong.2023. Tectonic paleogeographic framework of the fourth Member of Ordovician Majiagou Formation in Ordos basin and its significance for oil and gas exploration[J]. Acta Geologica Sinica,97(8):2645-2658.

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  • 收稿日期:2023-02-07
  • 最后修改日期:2023-04-25
  • 录用日期:2023-05-09
  • 在线发布日期: 2023-08-28