**7. Application**

As shown above, an understanding of sequence stratigraphy can be a very powerful tool for building a sequence stratigraphic framework for the lithofacies prediction. It can also help to interpret the depositional history and to predict fine-grained unconventional resource plays for a single well to a basin (**Figure 3**–**6**). **Figure 4** shows the successful production of 200,000 m<sup>3</sup> / day shale gas is from the predicted high-quality shale reservoir in TST and EHST interval with high TOC, high quartz content, and high gas content. At a regional scale, sequence stratigraphy can be used for the correlation of the stratigraphy, the lithology, the mineralogy, the geochemistry, and even rock fabrics. **Figure 7** shows that TST has the highest TOC content, total gas content and quartz content from Jiaoye1 well to Pengye1 well. At the same time, the TOC content has the similar changing patterns to gas content within Sequence A (lower member of the Longmaxi Fm): both show decreasing trends from TST to LHST. Also, gas content decreases with decreasing quartz content from TST to LHST, which indicates the shale in TST is highquality fracturing susceptible shale gas reservoir with the highest TOC, gas content, and brittle minerals content (**Figure 7**). The positive relationship between TOC, quartz content, and shale gas content in the Silurian Longmaxi shale is similar to that one of the Bartnett shale in the USA, which is attributed to the formation of biogenic quartz in an anoxic environment that is favorable for organic matter preservation [24]. Laterally, shale gas content and quartz content in TST decreases from Jiaoye1 well to Pengye1 well even though they have similar TOC. These Sequence Stratigraphy of Fine-Grained "Shale" Deposits: Case Studies of Representative Shales… http://dx.doi.org/10.5772/intechopen.71137 29

**Figure 7.** Correlation of stratigraphy, geochemistry, mineralogy, gas content, and rock fabrics within sequence stratigraphic framework across Jiaoye1 well and Pengye1 well. The light pink color represents quartz and the dark green color indicates clay minerals. The color indicates quartz content decreases upward and clay content increases upward at each well location.

verify the TST shale at the Jiaoye1 well has the better reservoir quality in time and space. The commercial development of the Jiaoshiba Shale Gas Field where Jiaoye1 is located proves the prediction of high-quality shale gas reservoir by using sequence stratigraphic approach.
