虎林盆地七虎林河坳陷油气地质条件分析
摘要
本文是在广泛的搜集前人研究资料的基础上,结合野外工作,对黑龙江省东部松辽盆地外围盆地之一的虎林盆地进行了比较全面与深入的研究。内容包括虎林盆地地层的划分,沉积体系的演化,虎林盆地的基底与沉积盖层的基本特征,盆地内主要断裂构造特征,盆地构造演化分析,盆地内烃源岩岩层、储层与盖层的时空分布规律,构造对圈闭和保存条件的影响和盆地内资源潜力分析等。重点研究了虎林盆地七虎林河坳陷的构造特征及其演化、盆地的沉降史分析,油气资源量评价。
Hulin basin is about 6500km2 in the south of Wandashan and in the west of Sikhote-Alin in Russian, which located at the eastern of Heilongjiang province, between the east of Central Asia - Mongolia Central structural domain and the northeast of west Pacific tectonic belt.
Through extensive collection of previous research data,combined with field work in Hulin Basin, these contents were studied in this paper, including the basic features of basement and sedimentary cover, the basin characteristics of fault structures, tectonic evolution of the basin, the space-time distribution regularity of source rock, oil-reservoir and cap rock, the tectonic effect on reserve condition and the calculation of oil-gas resource in the basin, etc. Study focuses on tectonic characteristics and evolution of qihulin depression, basin subsidence analysis, oil and gas resource evaluation in Hulin Basin.
Concerning Hulin Basin is a Mesozoic-Cenozoic basin, and the exploration degree in the research process is not very high, we must stick to study the basic geological data, beginning from the region data globally, so that we can hold the basin’s attribute in a wider field and a deeper degree. From the basic data such as structural of basement, the regional structural setting, sequence of strata, we can deepen the realization about the basin’s generating and evolution. From the strata sequence, we can analyze the structural unit.
Using the data of regional geological research and a wide range of results, we can carry out the study of geological characteristics of oil and gas basin so that estimates volume of oil and gas resources in the basin.
Hulin Basin sedimentary cover is mainly from Peide Formation, Qihulin formation of the Upper Jurassic, Xiayunshan formation, Shangyunshan formation, Zhushan formation and Dongshan formation of the Lower Cretaceous; Hulin formation of the Oligocene; Fujin formation of the Miocene, Daotaiqiao formation of the Pliocene to Quaternary
The sedimentary facies of Hulin basin had experienced a big change from marine sedimentary strata in Mesozoic to continental sedimentary strata in Cenozoic. Maine sedimentary stage generally revealed a pocess that from transgression peak to regression from Qihulin formation to Upper Yunshan formation; While continental sedimentary stage experienced a whole large-scale procedure that from transgression to regression, in which the second member of Hulin formation was the product during the transgression peak. The sedimental facies’surfaces displayed a similar change during each period, which the center of deposition and settlement located primarily in Qihulin River depression then in Muling River depression, showing the shallow sea facies or shallow to semi-deep lake facies, while coastal plain or shallow lake facies to the north or south sides.
Hulin Basin developed two sets of source rocks, which are mudstone rocks of Yunshan formation and Qihulin formation of Mesozoic and Hulin formation of Paleogene.
Distribution of Mesozoic source rocks is about 98-250km3. Hucan 1 borehole in the Qihulin river depression drilled Mesozoic mudstone which is about 402m, but the thickness of the largest layer is 25m. Study of the organic matter maturity indicates that Yunshan formation and Qihulin formation of H87-3 borehole is immature - low mature evolution stage.
Paleogene source rocks mainly include H1 and H2 in Hulin formation, but the mudstone distribution of H1 is larger than H2, which is about 193 km3. Organic matter is Sapropel - humic; organic matter mainly derived from terrestrial higher plants, low maturity, and the majority did not enter the oil threshold.
Hulin Basin can be divided into two sets of reservoir-cap combination, which is the lower combination: qihulin formation - the lower Yunshan formation and the upper Yunshan formation - Hulin formation; the upper combination: H1 and H2 - H3 and Fujin formation - the mudstone of H3 and Fujin formation.
Favorable oil source area of Hulin Basin is located the center of qihulin deposition depression. The region of over 300 meters thickness of Hulin formation source rocks is about 300km2, which is the most developed areas of source rocks in Hulin Basin. Lower Cretaceous dark mudstones just have some potential.
Hulin basin is about 6500km2 in the south of Wandashan and in the west of Sikhote-Alin in Russian, which located at the eastern of Heilongjiang province, between the east of Central Asia - Mongolia Central structural domain and the northeast of west Pacific tectonic belt.
Through extensive collection of previous research data,combined with field work in Hulin Basin, these contents were studied in this paper, including the basic features of basement and sedimentary cover, the basin characteristics of fault structures, tectonic evolution of the basin, the space-time distribution regularity of source rock, oil-reservoir and cap rock, the tectonic effect on reserve condition and the calculation of oil-gas resource in the basin, etc. Study focuses on tectonic characteristics and evolution of qihulin depression, basin subsidence analysis, oil and gas resource evaluation in Hulin Basin.
Concerning Hulin Basin is a Mesozoic-Cenozoic basin, and the exploration degree in the research process is not very high, we must stick to study the basic geological data, beginning from the region data globally, so that we can hold the basin’s attribute in a wider field and a deeper degree. From the basic data such as structural of basement, the regional structural setting, sequence of strata, we can deepen the realization about the basin’s generating and evolution. From the strata sequence, we can analyze the structural unit.
Using the data of regional geological research and a wide range of results, we can carry out the study of geological characteristics of oil and gas basin so that estimates volume of oil and gas resources in the basin.
Hulin Basin sedimentary cover is mainly from Peide Formation, Qihulin formation of the Upper Jurassic, Xiayunshan formation, Shangyunshan formation, Zhushan formation and Dongshan formation of the Lower Cretaceous; Hulin formation of the Oligocene; Fujin formation of the Miocene, Daotaiqiao formation of the Pliocene to Quaternary
The sedimentary facies of Hulin basin had experienced a big change from marine sedimentary strata in Mesozoic to continental sedimentary strata in Cenozoic. Maine sedimentary stage generally revealed a pocess that from transgression peak to regression from Qihulin formation to Upper Yunshan formation; While continental sedimentary stage experienced a whole large-scale procedure that from transgression to regression, in which the second member of Hulin formation was the product during the transgression peak. The sedimental facies’surfaces displayed a similar change during each period, which the center of deposition and settlement located primarily in Qihulin River depression then in Muling River depression, showing the shallow sea facies or shallow to semi-deep lake facies, while coastal plain or shallow lake facies to the north or south sides.
Hulin Basin developed two sets of source rocks, which are mudstone rocks of Yunshan formation and Qihulin formation of Mesozoic and Hulin formation of Paleogene.
Distribution of Mesozoic source rocks is about 98-250km3. Hucan 1 borehole in the Qihulin river depression drilled Mesozoic mudstone which is about 402m, but the thickness of the largest layer is 25m. Study of the organic matter maturity indicates that Yunshan formation and Qihulin formation of H87-3 borehole is immature - low mature evolution stage.
Paleogene source rocks mainly include H1 and H2 in Hulin formation, but the mudstone distribution of H1 is larger than H2, which is about 193 km3. Organic matter is Sapropel - humic; organic matter mainly derived from terrestrial higher plants, low maturity, and the majority did not enter the oil threshold.
Hulin Basin can be divided into two sets of reservoir-cap combination, which is the lower combination: qihulin formation - the lower Yunshan formation and the upper Yunshan formation - Hulin formation; the upper combination: H1 and H2 - H3 and Fujin formation - the mudstone of H3 and Fujin formation.
Favorable oil source area of Hulin Basin is located the center of qihulin deposition depression. The region of over 300 meters thickness of Hulin formation source rocks is about 300km2, which is the most developed areas of source rocks in Hulin Basin. Lower Cretaceous dark mudstones just have some potential.
引文
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[13]何承全,万传彪,杨明杰.黑龙江省东部虎林盆地欧特里夫-巴列姆期沟鞭藻类[J].古生物学报, 1999,38(2):183-203.
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