The controls of sandstone paleo-porosity in accumulation period to hydrocarbon distribution：A case study from Es3Mid in Niuzhuang Sag, Dongying Depression
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摘要: 在具有相同储集砂体和相似断层输导情况下，牛庄洼陷沙三中亚段砂岩体油藏长期存在以下难以解释的现象：1）现今砂岩孔隙度分布与油气分布不一致，高孔隙砂岩不含油而低孔隙砂岩含油；2）相同物性砂岩有的含油而有的不含油，含油砂体现今物性接近，但含油级别却存在很大差异。本文从古孔隙度恢复方面分析了牛庄洼陷西部地区沙三中砂岩储层在成藏期的储集条件，并探讨了成藏期储层临界孔隙度。研究发现：1）虽然现今储层物性下限很低，部分砂岩已经致密化，但成藏期的古孔隙度分布在18%～25%范围内，远大于成藏期临界孔隙度13.9%。但由于埋藏过程的差异导致砂岩储层后期减孔幅度不同，因而现今储层物性不能反映成藏期储层物性，成藏期孔隙度高并不能代表现今孔隙度高；2）成藏期高孔隙度带与现今油气分布范围高度一致，表明在相似断层输导条件下，由于储层物性级差优势形成油气优势运移通道，导致高孔隙度带砂体含油，因此，沙三中亚段岩性油藏富集在成藏期高孔隙带中，成藏期砂岩古孔隙度是油气成藏的重要控制因素，而现今砂岩储层高孔隙带在成藏期并不一定高。牛庄洼陷西部地区沙三中亚段储层中具有高古孔隙度的砂岩仍有较大勘探潜力。Abstract: In the similar conditions of sedimentary sand bodies and fault conduit system, the problems have existed within sandstone reservoirs of Es3Mid in Niuzhuang Sag for a long time as follows: 1)The distribution of sandstone porosity are inconsistent with hydrocarbon accumulation, which characterizes that the oil in the sandstones with low porosity rather than those with high porosity. 2)The oiliness of sandstones which have the same property are different, and the sandstones that the property is approximate show a distinct oil-bearing degree. This paper analyses the reservoir conditions and determines the critical porosity of the sandstone reservoirs in Niuzhuang Sag in accumulation period in paleo porosity recovery. The results demonstrate that the reservoir property is low at present and some of the reservoirs become tight, the paleo porosities which range from 18% to 25% are far more than the critical porosity. Because the loss of pore in bury history is different, so the porosity at present can not reflect that in accumulation period. The porosity was high in accumulation period, which cannot represent that it must high in present. The present reservoir location is consistent with the distribution of the high paleo porosity in accumulation period, which indicates that the high porosity belts prone to accumulate hydrocarbon because of the dominant migration pathways that generated by property differential in the similar fault conduit condition. Thus, the hydrocarbon mainly accumulates in the high porosity belts and the paleo porosity in accumulation period is a vital control factor. As a result, the sandstones with high paleo porosity of Es3Mid in Niuzhuang Sag have a major exploratory potentiality.
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Key words:
- Paleo porosity /
- Critical property /
- Dominant migration pathways /
- Es3Mid /
- Niuzhuang Sag
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