Sedimentary facies characteristics and accumulation systems of Albian-Turonian at the outer shelf-slope area of MSGB Basin

Chen Liang; Zhao Hongyan; Han Wenming; Kong Lingwu; Zhao Jiaqi; Feng Xin; Yu Yingmei

doi:10.19509/j.cnki.dzkq.2020.0417

Volume 39 Issue 4

Jul. 2020

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Article Navigation > Bulletin of Geological Science and Technology > 2020 > 39(4): 132-140

Chen Liang, Zhao Hongyan, Han Wenming, Kong Lingwu, Zhao Jiaqi, Feng Xin, Yu Yingmei. Sedimentary facies characteristics and accumulation systems of Albian-Turonian at the outer shelf-slope area of MSGB Basin[J]. Bulletin of Geological Science and Technology, 2020, 39(4): 132-140. doi: 10.19509/j.cnki.dzkq.2020.0417

Citation:

Chen Liang, Zhao Hongyan, Han Wenming, Kong Lingwu, Zhao Jiaqi, Feng Xin, Yu Yingmei. Sedimentary facies characteristics and accumulation systems of Albian-Turonian at the outer shelf-slope area of MSGB Basin[J]. Bulletin of Geological Science and Technology, 2020, 39(4): 132-140. doi: 10.19509/j.cnki.dzkq.2020.0417

Citation:

Chen Liang, Zhao Hongyan, Han Wenming, Kong Lingwu, Zhao Jiaqi, Feng Xin, Yu Yingmei. Sedimentary facies characteristics and accumulation systems of Albian-Turonian at the outer shelf-slope area of MSGB Basin[J]. Bulletin of Geological Science and Technology, 2020, 39(4): 132-140. doi: 10.19509/j.cnki.dzkq.2020.0417

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Sedimentary facies characteristics and accumulation systems of Albian-Turonian at the outer shelf-slope area of MSGB Basin

doi: 10.19509/j.cnki.dzkq.2020.0417

Received Date: 18 Jul 2019

Abstract

Abstract

In recent years, several large oil and gas discoveries have made the MSGB Basin a hot spot for international oil and gas explorations. Based on seismic data and drilling and logging data, this paper studies sedimentary facies and sedimentary models, and analyses reservoir physical properties, source rock evaluation and hydrocarbon accumulation models. The results show first that the multi-stage forced regressive delta is widely developed at the southern outer shelf of the basin. Controlled by the base surface cycle, the topset of delta is eroded, and the sand body is transported to the front of the delta to form forced regressive sands. The sand body is widely distributed near the edge of the shelf. Slope type controls the distribution patterns of deep-water fans, and southern faulted slope controls the distribution of the deep-water fans. Fans mainly develop in continental slope foot, close to the shelf edge. Gravity flow is carried far on the northern gentle slope, deep-water fans away from the shelf edge. We established two types of sedimentary models. Then, the results indicate the forced regressive deltas at the outer shelf and northern deep-water fans at gentle slope have good reservoir properties and high test productivity. Southern deep-water fan has poor reservoir properties due to cementation and slump debris. Also, oil-source correlation shows that oil and gas mainly come from Lower Cretaceous Aptian to Albian and Upper Cretaceous Cenomanian to Turonian marine source rocks. Aptian to Albian source rock with Ⅱ₂ kerogen type tends to generate gas and Cenomanian to Turonian source rocks with I kerogen type tends to generate oil. Lastly, there are three favorable hydrocarbon accumulation systems in the study area, namely Albian accumulation system at shelf margin, Albian to Turonian hydrocarbon accumulation system at slope foot and Cenomanian hydrocarbon accumulation system at distal slope. Hydrocarbon accumulation system at shelf margin and distal slope have greater exploration potential, a favorable direction for the next exploration.
- shelf margin,
- delta,
- deep-water fan,
- hydrocarbon accumulation model,
- MSGB Basin

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References(38)

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Sedimentary facies characteristics and accumulation systems of Albian-Turonian at the outer shelf-slope area of MSGB Basin

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Sedimentary facies characteristics and accumulation systems of Albian-Turonian at the outer shelf-slope area of MSGB Basin

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